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Profit and Loss Questions in English

Competitive Exam Quantitative Aptitude · Profit and Loss · Profit and Loss

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101
DifficultMCQ
Abhishek makes a profit of $Rs. 110$ if he sells a certain number of pens at the price of $Rs. 2.5$ per pen and incurs a loss of $Rs. 55$ if he sells the same number of pens for $Rs. 1.75$ per pen. How many pens does Abhishek have?
A
$220$
B
$240$
C
$200$
D
Cannot be determined

Solution

$ (A) $ Let the number of pens be $x$.
The cost price $(CP)$ of the pens remains the same in both cases.
We know that $CP = SP - \text{Profit}$ and $CP = SP + \text{Loss}$.
Equating the two expressions for $CP$:
$SP_1 - \text{Profit} = SP_2 + \text{Loss}$
Given:
$SP_1 = 2.5x$
$\text{Profit} = 110$
$SP_2 = 1.75x$
$\text{Loss} = 55$
Substituting these values into the equation:
$2.5x - 110 = 1.75x + 55$
Rearranging the terms:
$2.5x - 1.75x = 55 + 110$
$0.75x = 165$
$x = 165 / 0.75$
$x = 220$
Therefore, Abhishek has $220$ pens.
102
MediumMCQ
Ram purchased a computer set for $Rs. 12500$ and spent $Rs. 300$ on transportation and $Rs. 800$ on installation. At what price should he sell it to earn an overall profit of $15\%$? (in $Rs.$)
A
$14560$
B
$14375$
C
$15460$
D
$15640$

Solution

(D) The total Cost Price $(CP)$ of the computer set includes the purchase price,transportation,and installation charges.
Total $CP = 12500 + 300 + 800 = Rs. 13600$.
To earn a profit of $15\%$,the Selling Price $(SP)$ is calculated as:
$SP = CP \times (1 + \frac{\text{Profit}\%}{100})$
$SP = 13600 \times (1 + \frac{15}{100})$
$SP = 13600 \times 1.15 = Rs. 15640$.
103
MediumMCQ
Mahesh purchased $25\, kg$ of rice at $Rs. 32$ per $kg$ and $15\, kg$ of rice at $Rs. 36$ per $kg.$ He mixed the two varieties of rice and sold it at $Rs. 40.20$ per $kg.$ What is the percent profit earned (in $\%$)?
A
$25$
B
$40$
C
$30$
D
$20$

Solution

(D) Total $CP$ of the mixture $= (25 \times 32) + (15 \times 36) = 800 + 540 = Rs. 1340$.
Total quantity of rice $= 25 + 15 = 40\, kg$.
$CP$ of $1\, kg$ of the mixture $= \frac{1340}{40} = Rs. 33.50$.
$SP$ of $1\, kg$ of the mixture $= Rs. 40.20$.
Profit $= SP - CP = 40.20 - 33.50 = Rs. 6.70$.
Profit $\% = \left( \frac{\text{Profit}}{CP} \right) \times 100 = \left( \frac{6.70}{33.50} \right) \times 100 = 0.2 \times 100 = 20\%$.
104
DifficultMCQ
While selling a watch,a shopkeeper gives a discount of $15 \%$. If he gives a discount of $20 \%$,he earns $Rs. 51$ less as profit. What is the original price of the watch? (in $Rs$)
A
$920$
B
$985$
C
$1125$
D
$1020$

Solution

(D) Let the original price (marked price) of the watch be $Rs. x$.
In the first case,the discount is $15 \%$,so the selling price is $x \times (1 - 0.15) = 0.85x$.
In the second case,the discount is $20 \%$,so the selling price is $x \times (1 - 0.20) = 0.80x$.
The difference in the selling price is given as $Rs. 51$,which represents the reduction in profit.
Therefore,$0.85x - 0.80x = 51$.
$0.05x = 51$.
$x = \frac{51}{0.05} = \frac{5100}{5} = 1020$.
Thus,the original price of the watch is $Rs. 1020$.
105
MediumMCQ
$A$ shopkeeper purchased $245$ pieces of an article at $Rs. 30$ per piece. He spent $Rs. 980$ on transport and $Rs. 1470$ on packing the articles. He sold the articles at the rate of $Rs. 50$ per piece. What is the percent profit earned?
A
$25$
B
$20$
C
$28$
D
$22.5$

Solution

(A) Cost Price $(CP)$ of $245$ pieces of article $= 245 \times 30 = Rs. 7350$.
Total $CP$ (including transport and packing) $= 7350 + 980 + 1470 = Rs. 9800$.
$CP$ of $1$ piece $= \frac{9800}{245} = Rs. 40$.
Selling Price $(SP)$ of $1$ piece $= Rs. 50$.
Profit $= SP - CP = 50 - 40 = Rs. 10$.
Profit $\% = \left( \frac{\text{Profit}}{CP} \right) \times 100 = \left( \frac{10}{40} \right) \times 100 = 25 \%$.
106
MediumMCQ
An article is marked for sale at $Rs. 504$. The shopkeeper gives a discount of $5\%$ on the marked price and still earns a profit of $20\%$. What is the cost price of the article? (in $Rs.$)
A
$399$
B
$405$
C
$403$
D
$400$

Solution

(A) Given: Marked Price $(MP)$ = $Rs. 504$,Discount = $5\%$,Profit = $20\%$.
First,calculate the Selling Price $(SP)$:
$SP = MP - (Discount\% \text{ of } MP)$
$SP = 504 - (0.05 \times 504) = 504 - 25.2 = Rs. 478.80$.
Now,calculate the Cost Price $(CP)$:
We know that $SP = CP \times (1 + \text{Profit}\%)$.
$478.80 = CP \times (1 + 0.20)$
$478.80 = CP \times 1.20$
$CP = \frac{478.80}{1.20} = Rs. 399$.
Therefore,the cost price of the article is $Rs. 399$.
107
MediumMCQ
$A$ shopkeeper sold an article for $Rs. 400$ after giving a $20\%$ discount on the labelled price and made a $30\%$ profit on the cost price. What would have been the percentage profit,had he not given the discount (in $\%$)?
A
$25$
B
$35$
C
$50$
D
$62.5$

Solution

(D) Let the cost price be $CP$ and the marked price be $MP$.
Given that the shopkeeper makes a $30\%$ profit on $CP$,the selling price $SP = 1.30 \times CP$.
Also,the shopkeeper gives a $20\%$ discount on $MP$,so $SP = 0.80 \times MP$.
Equating the two expressions for $SP$: $0.80 \times MP = 1.30 \times CP$,which gives $MP = \frac{1.30}{0.80} \times CP = 1.625 \times CP$.
If no discount is given,the selling price would be equal to the marked price,i.e.,$SP_{new} = MP = 1.625 \times CP$.
The profit percentage would then be $\frac{SP_{new} - CP}{CP} \times 100 = \frac{1.625 \times CP - CP}{CP} \times 100 = 0.625 \times 100 = 62.5\%$.
108
EasyMCQ
Suresh purchased a $TV$ set for $Rs. 11250$. He spent $Rs. 800$ on installation and $Rs. 150$ on transportation. At what price should it be sold so that the profit earned would be $15\%$,if no discount was offered? (in $Rs.$)
A
$12938$
B
$14030$
C
$13450$
D
$15467$

Solution

(B) The total Cost Price $(CP)$ for Suresh includes the purchase price,installation charges,and transportation costs.
$CP = 11250 + 800 + 150 = 12200 \text{ Rs.}$
To earn a profit of $15\%$,the Selling Price $(SP)$ is calculated as:
$SP = CP \times (1 + \frac{\text{Profit}\%}{100})$
$SP = 12200 \times (1 + \frac{15}{100})$
$SP = 12200 \times 1.15 = 14030 \text{ Rs.}$
Therefore,the $TV$ should be sold for $14030 \text{ Rs.}$
109
MediumMCQ
$Mr.$ $A$ sold goods to $Mr.$ $B$ at a $10\%$ discount on the printed rate. The discounted value is $Rs. 1242$. If a $15\%$ profit is earned on the purchase rate by selling the goods at the printed rate,what is the purchase rate? (in $Rs.$)
A
$1242$
B
$1380$
C
$1280$
D
$1200$

Solution

(D) Step $1$: Find the printed rate (marked price).
Given that the discounted value is $Rs. 1242$ at a $10\%$ discount.
Let the printed rate be $P$.
$P \times (1 - 0.10) = 1242$
$P \times 0.90 = 1242$
$P = 1242 / 0.90 = 1380$.
Step $2$: Find the purchase rate (cost price).
It is given that selling the goods at the printed rate $(Rs. 1380)$ yields a $15\%$ profit on the purchase rate $(CP)$.
$SP = CP \times (1 + \text{Profit}\%)$
$1380 = CP \times (1 + 0.15)$
$1380 = CP \times 1.15$
$CP = 1380 / 1.15 = 1200$.
Therefore,the purchase rate is $Rs. 1200$.
110
MediumMCQ
Rajesh purchased a mobile phone and a refrigerator for $Rs. 12000$ and $Rs. 10000$ respectively. She sold the refrigerator at a loss of $12\%$ and the mobile phone at a profit of $8\%$. What is her overall loss or profit?
A
Loss of $Rs. 280$
B
Profit of $Rs. 2160$
C
Loss of $Rs. 240$
D
Profit of $Rs. 2060$

Solution

(C) Cost Price $(CP)$ of the refrigerator $= Rs. 10000$. Loss $= 12\%$.
Loss amount $= 12\% \text{ of } 10000 = \frac{12}{100} \times 10000 = Rs. 1200$.
Selling Price $(SP)$ of the refrigerator $= 10000 - 1200 = Rs. 8800$.
Cost Price $(CP)$ of the mobile phone $= Rs. 12000$. Profit $= 8\%$.
Profit amount $= 8\% \text{ of } 12000 = \frac{8}{100} \times 12000 = Rs. 960$.
Selling Price $(SP)$ of the mobile phone $= 12000 + 960 = Rs. 12960$.
Total $CP = 10000 + 12000 = Rs. 22000$.
Total $SP = 8800 + 12960 = Rs. 21760$.
Since Total $SP < $ Total $CP$,there is an overall loss.
Loss $= 22000 - 21760 = Rs. 240$.
111
MediumMCQ
Abhishek purchased $140$ shirts and $250$ trousers at $Rs. 450$ and $Rs. 550$ respectively. What should be the overall average selling price of shirts and trousers so that $40 \%$ profit is earned? (in $Rs.$) (rounded off to the next integer)
A
$725$
B
$710$
C
$720$
D
$700$

Solution

(C) Total Cost Price $(CP)$ of $140$ shirts and $250$ trousers is calculated as:
$Total CP = (140 \times 450) + (250 \times 550) = 63000 + 137500 = Rs. 200500$
To earn a $40 \%$ profit,the total Selling Price $(SP)$ must be:
$Total SP = CP \times (1 + \frac{40}{100}) = 200500 \times 1.4 = Rs. 280700$
The total number of items is $140 + 250 = 390$.
The average selling price per item is:
$Average SP = \frac{Total SP}{Total Items} = \frac{280700}{390} \approx 719.74$
Rounding off to the next integer,we get $Rs. 720$.
112
MediumMCQ
$A$ trader marks his goods $40 \%$ above the cost price and allows a discount of $25 \%$. The profit he makes,is in $\%$:
A
$15$
B
$10$
C
$5$
D
$2$

Solution

(C) Let the cost price $(CP)$ be $Rs. 100$.
The marked price $(MP)$ is $40 \%$ above the $CP$,so $MP = 100 + 40 = Rs. 140$.
$A$ discount of $25 \%$ is allowed on the $MP$,so the selling price $(SP)$ is $140 - (25 \% \text{ of } 140) = 140 - 35 = Rs. 105$.
The profit is $SP - CP = 105 - 100 = Rs. 5$.
The profit percentage is $\left( \frac{\text{Profit}}{CP} \right) \times 100 = \left( \frac{5}{100} \right) \times 100 = 5 \%$.
113
DifficultMCQ
$A$ man sold his two cars for $Rs. 4.5$ lakh each. In the sale of the first car, he incurred $20\%$ profit, and in the sale of the second, he incurred $20\%$ loss. What is the total amount of profit or loss?
A
profit of $Rs. 20250$
B
loss of $Rs. 20250$
C
profit of $Rs. 37500$
D
loss of $Rs. 37500$

Solution

(D) Selling price of each car $(SP)$ = $Rs. 4,50,000$.
Total $SP$ = $4,50,000 + 4,50,000 = Rs. 9,00,000$.
For the first car: $SP = 4,50,000$, Profit = $20\%$.
Cost Price $(CP_1)$ = $SP / (1 + Profit\%) = 4,50,000 / 1.2 = Rs. 3,75,000$.
For the second car: $SP = 4,50,000$, Loss = $20\%$.
Cost Price $(CP_2)$ = $SP / (1 - Loss\%) = 4,50,000 / 0.8 = Rs. 5,62,500$.
Total $CP = CP_1 + CP_2 = 3,75,000 + 5,62,500 = Rs. 9,37,500$.
Since Total $CP$ > Total $SP$, there is a loss.
Loss = Total $CP - $ Total $SP = 9,37,500 - 9,00,000 = Rs. 37,500$.
114
DifficultMCQ
By selling an article at $80 \%$ of its marked price,a shopkeeper makes a loss of $10 \%$. What will be the profit percentage if he sells it at $95 \%$ of its marked price (in $\%$)?
A
$6.9$
B
$5$
C
$5.9$
D
$12.5$

Solution

(A) Let the marked price $(MP)$ be $Rs. 100$.
Selling price $(SP_1)$ at $80 \%$ of $MP = 0.80 \times 100 = Rs. 80$.
Given a loss of $10 \%$,the cost price $(CP)$ is calculated as:
$CP = \frac{SP_1}{1 - \text{Loss}\%} = \frac{80}{0.90} = Rs. \frac{800}{9}$.
Now,if the article is sold at $95 \%$ of its $MP$,the new selling price $(SP_2)$ is $Rs. 95$.
Profit = $SP_2 - CP = 95 - \frac{800}{9} = \frac{855 - 800}{9} = Rs. \frac{55}{9}$.
Profit percentage = $\left( \frac{\text{Profit}}{CP} \right) \times 100 = \left( \frac{55/9}{800/9} \right) \times 100 = \frac{55}{800} \times 100 = \frac{55}{8} = 6.875 \% \approx 6.9 \%$.
115
DifficultMCQ
$A$ trader purchases a wrist watch and a pendulum for $Rs. 390$. He sells them making a profit of $10 \%$ on the watch and $15 \%$ on the pendulum. He earns a total profit of $Rs. 51.50$. The difference between the original prices of the pendulum and the watch is equal to? (in $Rs.$)
A
$80$
B
$120$
C
$110$
D
$100$

Solution

(C) Let the cost price $(CP)$ of the wrist watch be $Rs. x$.
Then,the $CP$ of the pendulum is $Rs. (390 - x)$.
Profit on the watch $= 10 \% \text{ of } x = 0.10x$.
Profit on the pendulum $= 15 \% \text{ of } (390 - x) = 0.15(390 - x) = 58.5 - 0.15x$.
Total profit $= 0.10x + 58.5 - 0.15x = 58.5 - 0.05x$.
Given that the total profit is $Rs. 51.50$,we have:
$58.5 - 0.05x = 51.50$
$0.05x = 58.5 - 51.50 = 7.00$
$x = \frac{7}{0.05} = 140$.
So,the $CP$ of the wrist watch is $Rs. 140$.
The $CP$ of the pendulum is $390 - 140 = Rs. 250$.
The difference between the original prices is $250 - 140 = Rs. 110$.
116
DifficultMCQ
$A$ tradesman gives $4 \%$ discount on the marked price and gives $1$ book free for buying every $15$ books and thus gains $35 \%$. The marked price is increased above the cost price by (approx.) (in $\%$).
A
$40$
B
$3$
C
$50$
D
$20$

Solution

(A) Let the $CP$ of each book be $Rs. 100$.
For every $15$ books purchased,the customer gets $1$ book free,meaning the customer receives $16$ books for the price of $15$.
The total $CP$ for $16$ books is $16 \times 100 = Rs. 1600$.
The tradesman gains $35 \%$,so the total $SP$ for $16$ books is $1600 \times 1.35 = Rs. 2160$.
The $SP$ of $1$ book is $2160 / 16 = Rs. 135$.
Since the tradesman gives a $4 \%$ discount on the marked price $(MP)$,we have $0.96 \times MP = 135$.
$MP = 135 / 0.96 = Rs. 140.625$.
The percentage increase of $MP$ over $CP$ is $((140.625 - 100) / 100) \times 100 = 40.625 \%$.
Rounding to the nearest integer,the increase is approximately $40 \%$.
117
DifficultMCQ
$A$ shopkeeper purchased $150$ identical pieces of furniture at the rate of $Rs. 250$ each. He spent an amount of $Rs. 2500$ on packing. He fixed the price of each furniture at $Rs. 320$. However,he decided to give a discount of $5 \%$ on the labeled price. What is the percent profit earned by him (in $\%$)?
A
$16$
B
$15$
C
$14$
D
$20$

Solution

(C) Total cost price of $150$ pieces of furniture $= 150 \times 250 = Rs. 37500$.
Total packing charges $= Rs. 2500$.
Total investment (Total Cost Price) $= 37500 + 2500 = Rs. 40000$.
Cost price per piece $= \frac{40000}{150} = Rs. \frac{800}{3}$.
Marked price per piece $= Rs. 320$.
Discount $= 5 \%$ of $320 = \frac{5}{100} \times 320 = Rs. 16$.
Selling price per piece $= 320 - 16 = Rs. 304$.
Profit per piece $= 304 - \frac{800}{3} = \frac{912 - 800}{3} = Rs. \frac{112}{3}$.
Profit percentage $= \left( \frac{\text{Profit}}{\text{Cost Price}} \right) \times 100 = \left( \frac{112/3}{800/3} \right) \times 100 = \frac{112}{800} \times 100 = \frac{112}{8} = 14 \%$.
118
DifficultMCQ
An $Ox$ and a carriage together cost $Rs. 8000$. The ox is sold at a profit of $10\%$ and the carriage is sold at a loss of $10\%$. If the total profit made is $2.5\%$,then what is the cost price of the ox? (in $Rs.$)
A
$3000$
B
$3500$
C
$4000$
D
$5000$

Solution

(D) Let the cost price $(CP)$ of the ox be $Rs. x$.
Then,the $CP$ of the carriage is $Rs. (8000 - x)$.
The selling price $(SP)$ of the ox after a $10\%$ profit is $x + 0.10x = 1.1x$.
The $SP$ of the carriage after a $10\%$ loss is $(8000 - x) - 0.10(8000 - x) = 0.9(8000 - x)$.
The total cost price is $Rs. 8000$. The total profit is $2.5\%$,so the total selling price is $8000 \times (1 + 0.025) = 8000 \times 1.025 = Rs. 8200$.
Equating the sum of individual selling prices to the total selling price:
$1.1x + 0.9(8000 - x) = 8200$
$1.1x + 7200 - 0.9x = 8200$
$0.2x = 8200 - 7200$
$0.2x = 1000$
$x = 1000 / 0.2 = 5000$.
Therefore,the cost price of the ox is $Rs. 5000$.
119
DifficultMCQ
With a $5 \%$ discount on the cost of sugar,a buyer could purchase $2 \text{ kg}$ more sugar for $Rs. 608$. What is the initial selling price of sugar per kg?
A
$15.50$
B
$15$
C
$16.50$
D
$16$

Solution

(D) Let the initial price of sugar be $P$ per kg.
Initial quantity purchased for $Rs. 608$ is $Q = \frac{608}{P}$ kg.
After a $5 \%$ discount,the new price is $P' = 0.95P$.
The new quantity purchased for $Rs. 608$ is $Q' = \frac{608}{0.95P}$.
Given that the buyer can purchase $2 \text{ kg}$ more,we have $Q' - Q = 2$.
$\frac{608}{0.95P} - \frac{608}{P} = 2$.
$\frac{608}{P} \left( \frac{1}{0.95} - 1 \right) = 2$.
$\frac{608}{P} \left( \frac{1 - 0.95}{0.95} \right) = 2$.
$\frac{608}{P} \left( \frac{0.05}{0.95} \right) = 2$.
$\frac{608}{P} \left( \frac{1}{19} \right) = 2$.
$608 = 38P$.
$P = \frac{608}{38} = 16$.
Therefore,the initial selling price of sugar is $Rs. 16$ per kg.
120
DifficultMCQ
$A$ trader marked his goods at $20 \%$ above the cost price. He sold half the stock at the marked price,one quarter at a discount of $20 \%$ on the marked price,and the rest at a discount of $40 \%$ on the marked price. What is his total gain percentage?
A
$2$
B
$4.5$
C
$13.5$
D
$15$

Solution

(A) Let the total quantity of goods be $4$ units and the cost price $(CP)$ of each unit be $Rs. 100$.
Total $CP = 4 \times 100 = Rs. 400$.
Marked Price $(MP)$ per unit $= 100 + 20\% \text{ of } 100 = Rs. 120$.
Total $MP$ for $4$ units $= 4 \times 120 = Rs. 480$.
Now,the trader sells the stock as follows:
$1$. Half the stock ($2$ units) at $MP$: $2 \times 120 = Rs. 240$.
$2$. One quarter ($1$ unit) at $20\%$ discount on $MP$: $120 - 20\% \text{ of } 120 = 120 - 24 = Rs. 96$.
$3$. The rest ($1$ unit) at $40\%$ discount on $MP$: $120 - 40\% \text{ of } 120 = 120 - 48 = Rs. 72$.
Total Selling Price $(SP)$ $= 240 + 96 + 72 = Rs. 408$.
Total Gain $= SP - CP = 408 - 400 = Rs. 8$.
Gain percentage $= (\text{Gain} / CP) \times 100 = (8 / 400) \times 100 = 2\%$.
121
MediumMCQ
$A$ shopkeeper marks his goods at $25\%$ above his cost price and allows customers a discount of $12 \frac{1}{2}\%$ for cash. Find his $\%$ profit?
A
$12 \frac{4}{5}\%$
B
$9 \frac{3}{7}\%$
C
$7 \frac{5}{8}\%$
D
$9 \frac{3}{8}\%$

Solution

(D) Let the cost price $(CP)$ be $Rs. 100$.
The marked price $(MP)$ is $25\%$ above the $CP$, so $MP = 100 + 25 = Rs. 125$.
The discount offered is $12 \frac{1}{2}\%$ of the $MP$, which is $\frac{25}{2} \% = 0.125$.
Discount amount $= 125 \times \frac{25}{2 \times 100} = 125 \times \frac{1}{8} = Rs. 15.625$ or $Rs. 15 \frac{5}{8}$.
The selling price $(SP)$ is $MP - \text{Discount} = 125 - 15.625 = Rs. 109.375$ or $Rs. 109 \frac{3}{8}$.
Profit $= SP - CP = 109.375 - 100 = Rs. 9.375$.
Profit percentage $= \frac{\text{Profit}}{CP} \times 100 = \frac{9.375}{100} \times 100 = 9.375\%$, which is $9 \frac{3}{8}\%$.
122
MediumMCQ
$A$ trader marks the price of his goods $25 \%$ above the cost price but allows a $12.5 \%$ discount for cash payment. If he sells the goods for $Rs. 875$,find the cost price of the goods (in $Rs.$).
A
$800$
B
$875$
C
$925$
D
$975$

Solution

(A) Let the cost price $(CP)$ be $x$.
The marked price $(MP)$ is $25 \%$ above the cost price,so $MP = x \times (1 + 0.25) = 1.25x$.
$A$ discount of $12.5 \%$ is allowed on the marked price,so the selling price $(SP)$ is $MP \times (1 - 0.125) = 1.25x \times 0.875$.
Given that $SP = Rs. 875$,we have:
$1.25x \times 0.875 = 875$
$x = \frac{875}{1.25 \times 0.875}$
$x = \frac{875}{1.09375} = 800$
Alternatively,calculating $MP$ first:
$MP = 875 \times \left(\frac{100}{100 - 12.5}\right) = 875 \times \left(\frac{100}{87.5}\right) = 1000$.
Now,$CP = MP \times \left(\frac{100}{100 + 25}\right) = 1000 \times \left(\frac{100}{125}\right) = 800$.
123
DifficultMCQ
Harkesh bought a certain quantity of tomato at the rate of $Rs. 1500$ per quintal. $10 \%$ of the tomato was spoiled. At what price in $Rs.$ per quintal should he sell the remaining to gain $20 \%$ of his outlay?
A
$1800$
B
$2000$
C
$2200$
D
$2400$

Solution

(B) Let the total quantity of tomato be $100 \text{ quintals}$.
Total cost price $(CP)$ $= 100 \times 1500 = Rs. 1,50,000$.
Since $10 \%$ of the tomato is spoiled,the remaining quantity is $100 - 10 = 90 \text{ quintals}$.
To gain $20 \%$ on the total outlay,the total selling price $(SP)$ must be $120 \%$ of the total $CP$.
Total $SP = 1,50,000 \times 1.20 = Rs. 1,80,000$.
Selling price per quintal for the remaining $90 \text{ quintals} = \frac{1,80,000}{90} = Rs. 2000$ per quintal.
124
DifficultMCQ
Aman buys $5$ laptops and $7$ computers for $Rs. 58500$. He sells the laptops at a profit of $10\%$ and computers at a profit of $16\%$ and his total gain is $Rs. 7110$. What price does he pay for a laptop? (in $Rs.$)
A
$7500$
B
$8200$
C
$9100$
D
$10500$

Solution

(A) Let the cost price of one laptop be $Rs. y$.
The total cost price of $5$ laptops is $Rs. 5y$.
The total cost price of $7$ computers is $Rs. (58500 - 5y)$.
The total profit is given by the sum of profits from laptops and computers:
$10\% \text{ of } 5y + 16\% \text{ of } (58500 - 5y) = 7110$
$\frac{10}{100} \times 5y + \frac{16}{100} \times (58500 - 5y) = 7110$
$0.5y + 0.16(58500 - 5y) = 7110$
$0.5y + 9360 - 0.8y = 7110$
$-0.3y = 7110 - 9360$
$-0.3y = -2250$
$y = \frac{2250}{0.3} = 7500$
Therefore,the cost price of one laptop is $Rs. 7500$.
125
MediumMCQ
$A$ reduction of $10 \%$ in the price of rice enables a person to obtain $25 \text{ kg}$ more for $Rs. 2250$. Find the reduced price per $\text{kg}$ of the rice (in $Rs.$).
A
$8.50$
B
$9$
C
$10.50$
D
$11$

Solution

(B) Let the original price of rice be $x$ per $\text{kg}$.
Total amount spent = $Rs. 2250$.
Original quantity of rice = $\frac{2250}{x} \text{ kg}$.
Reduced price = $x - 0.10x = 0.90x$.
New quantity of rice = $\frac{2250}{0.90x} = \frac{2500}{x} \text{ kg}$.
According to the problem,the difference in quantity is $25 \text{ kg}$:
$\frac{2500}{x} - \frac{2250}{x} = 25$.
$\frac{250}{x} = 25$.
$x = 10$.
The original price was $Rs. 10$ per $\text{kg}$.
The reduced price is $10 \times 0.90 = Rs. 9$ per $\text{kg}$.
Alternatively: $A$ reduction of $10 \%$ on $Rs. 2250$ is $Rs. 225$. This saving allows the purchase of $25 \text{ kg}$ of rice at the new price. Therefore,the reduced price per $\text{kg}$ is $\frac{225}{25} = Rs. 9$.
126
MediumMCQ
$A$ shopkeeper mixes $26 \, kg$ of wheat which costs $Rs. 20$ per $kg$ with $30 \, kg$ of wheat which costs $Rs. 36$ per $kg$ and sells the mixture at $Rs. 30$ per $kg$. Find the profit percent. (in $\%$)
A
$5$
B
$9$
C
$12$
D
$15$

Solution

(A) Total Cost Price $(CP)$ of $26 \, kg$ wheat $= 26 \times 20 = Rs. 520$.
Total Cost Price $(CP)$ of $30 \, kg$ wheat $= 30 \times 36 = Rs. 1080$.
Total Cost Price of the mixture $= 520 + 1080 = Rs. 1600$.
Total quantity of the mixture $= 26 + 30 = 56 \, kg$.
Total Selling Price $(SP)$ of $56 \, kg$ mixture $= 56 \times 30 = Rs. 1680$.
Profit $= SP - CP = 1680 - 1600 = Rs. 80$.
Profit percent $= (\text{Profit} / CP) \times 100 = (80 / 1600) \times 100 = 5 \%$.
127
DifficultMCQ
$A$ sold a pen to $B$ at a profit of $20\%,$ $B$ sold the same pen to $C$ for $Rs.\,75$ thereby making a profit of $25 \% .$ Find the price at which $A$ bought the pen? (in $Rs.$)
A
$20$
B
$42$
C
$50$
D
$64$

Solution

(C) Let the cost price for $A$ be $x$.
$A$ sold the pen to $B$ at a profit of $20\%$,so the cost price for $B$ is $x \times (1 + 0.20) = 1.2x$.
$B$ sold the pen to $C$ for $Rs.\,75$ at a profit of $25\%$.
Therefore,the cost price for $B$ is $\frac{75}{1 + 0.25} = \frac{75}{1.25} = Rs.\,60$.
Equating the two values for the cost price of $B$: $1.2x = 60$.
Solving for $x$: $x = \frac{60}{1.2} = 50$.
Thus,$A$ bought the pen for $Rs.\,50$.
128
DifficultMCQ
Seema sells a pen to Sapna at a profit of $25 \%$. Sapna sells it to Asha at a profit of $10 \%$ and Asha sells it to Kavita at a profit of $5 \%$. If Asha sells it for $Rs.\,231$,find the cost price at which Seema bought the pen? (in $Rs.$)
A
$195$
B
$160$
C
$145$
D
$135$

Solution

(B) Let the cost price $(CP)$ of the pen for Seema be $Rs.\,x$.
Seema sells it to Sapna at a profit of $25 \%$,so the $CP$ for Sapna is $x \times (1 + 0.25) = 1.25x$.
Sapna sells it to Asha at a profit of $10 \%$,so the $CP$ for Asha is $1.25x \times (1 + 0.10) = 1.25x \times 1.1 = 1.375x$.
Asha sells it to Kavita at a profit of $5 \%$,so the selling price $(SP)$ for Asha is $1.375x \times (1 + 0.05) = 1.375x \times 1.05 = 1.44375x$.
Given that Asha sells it for $Rs.\,231$,we have:
$1.44375x = 231$
$x = \frac{231}{1.44375}$
$x = 160$
Therefore,the cost price at which Seema bought the pen is $Rs.\,160$.
129
MediumMCQ
Mohit purchased $40 \, kg$ of wheat at $Rs. 12.50$ per $kg$ and $25 \, kg$ of wheat at $Rs. 15.10$ per $kg$. He mixed the two qualities of wheat for selling. At what rate should it be sold to gain $10 \%$? (in $Rs.$)
A
$13.25$
B
$13.50$
C
$14.75$
D
$14.85$

Solution

(D) Step $1$: Calculate the total cost price $(CP)$ of the mixture.
Total $CP = (40 \times 12.50) + (25 \times 15.10) = 500 + 377.50 = Rs. 877.50$.
Step $2$: Calculate the total weight of the mixture.
Total weight $= 40 + 25 = 65 \, kg$.
Step $3$: Calculate the $CP$ per $kg$ of the mixture.
$CP$ per $kg = \frac{877.50}{65} = Rs. 13.50$.
Step $4$: Calculate the selling price $(SP)$ to gain $10 \%$.
$SP = CP \times (1 + \frac{\text{Gain} \%}{100}) = 13.50 \times (1 + 0.10) = 13.50 \times 1.10 = Rs. 14.85$.
Therefore,the mixture should be sold at $Rs. 14.85$ per $kg$.
130
DifficultMCQ
If the cost price of $20$ articles is equal to the selling price of $15$ articles,find the profit percent?
A
$33 \frac{1}{2} \%$
B
$33 \frac{1}{3} \%$
C
$33 \frac{1}{5} \%$
D
$33 \frac{1}{7} \%$

Solution

(B) Let the cost price $(CP)$ of $1$ article be $x$.
Then,$CP$ of $20$ articles $= 20x$.
Given that $CP$ of $20$ articles $= SP$ of $15$ articles.
So,$SP$ of $15$ articles $= 20x$.
$SP$ of $1$ article $= \frac{20x}{15} = \frac{4x}{3}$.
Profit $= SP - CP = \frac{4x}{3} - x = \frac{x}{3}$.
Profit $\% = \left( \frac{\text{Profit}}{CP} \right) \times 100 = \left( \frac{x/3}{x} \right) \times 100 = \frac{100}{3} \% = 33 \frac{1}{3} \%$.
131
MediumMCQ
$A$ trader sells rice at a profit of $5 \%$ and uses a weight which is $25 \%$ less. Find the total percentage gain.
A
$20$
B
$30$
C
$40$
D
$50$

Solution

(C) Let the cost price of $1 \ kg$ of rice be $₹ 100$.
The trader sells the rice at a $5 \%$ profit,so the selling price for the quantity he actually gives is $₹ 105$.
Since he uses a weight that is $25 \%$ less,he is actually giving $1000 \ g - 250 \ g = 750 \ g$ of rice instead of $1000 \ g$.
The cost price of $750 \ g$ of rice is $₹ 75$.
Now,the trader sells $750 \ g$ for $₹ 105$.
Profit $= \text{Selling Price} - \text{Cost Price} = 105 - 75 = 30$.
Percentage Profit $= \left( \frac{\text{Profit}}{\text{Cost Price}} \right) \times 100 = \left( \frac{30}{75} \right) \times 100 = \frac{2}{5} \times 100 = 40 \%$.
132
DifficultMCQ
$A$ person purchases $8$ pens for ₹ $10$ and sells $10$ pens for ₹ $8$. How much profit or loss percentage does he make?
A
$30 \%$ gain
B
$30 \%$ loss
C
$36 \%$ gain
D
$36 \%$ loss

Solution

(D) Cost price of $8$ pens $= ₹ 10$.
Cost price of $1$ pen $= ₹ \frac{10}{8} = ₹ 1.25$.
Selling price of $10$ pens $= ₹ 8$.
Selling price of $1$ pen $= ₹ \frac{8}{10} = ₹ 0.80$.
Since the selling price is less than the cost price,there is a loss.
Loss $= \text{Cost Price} - \text{Selling Price} = 1.25 - 0.80 = ₹ 0.45$.
Loss percentage $= \left( \frac{\text{Loss}}{\text{Cost Price}} \right) \times 100 = \left( \frac{0.45}{1.25} \right) \times 100 = 36 \%$.
Alternatively,using the cross-multiplication method:
$\text{Loss percentage} = \left( \frac{x^2 - y^2}{x^2} \right) \times 100$ where $x$ is the number of pens bought for $y$ rupees.
Here,$8$ pens for $10$ rupees and $10$ pens for $8$ rupees.
Loss percentage $= \frac{10^2 - 8^2}{10^2} \times 100 = \frac{100 - 64}{100} \times 100 = 36 \%$.
Therefore,the loss is $36 \%$.
Solution diagram
133
MediumMCQ
$A$ shopkeeper buys articles at $8$ for $Rs\,16$ and sells them at $9$ for $Rs\,20$. What is his gain or loss percent?
A
$10 \%$ loss
B
$10 \%$ gain
C
$11 \frac{1}{9} \%$ gain
D
$11 \frac{1}{9} \%$ loss

Solution

(C) Cost Price $(CP)$ of $8$ articles $= Rs\,16$. Therefore,$CP$ of $1$ article $= Rs\,16/8 = Rs\,2$.
Selling Price $(SP)$ of $9$ articles $= Rs\,20$. Therefore,$SP$ of $1$ article $= Rs\,20/9$.
Since $SP > CP$,there is a gain.
Gain $= SP - CP = \frac{20}{9} - 2 = \frac{20-18}{9} = Rs\,\frac{2}{9}$.
Gain percent $= \left( \frac{\text{Gain}}{CP} \times 100 \right) \% = \left( \frac{2/9}{2} \times 100 \right) \% = \frac{100}{9} \% = 11 \frac{1}{9} \% \text{ gain}$.
Solution diagram
134
EasyMCQ
$A$ person bought an article for $Rs. 240$. For how much should he sell it so as to lose $20\%$?
A
$120$
B
$180$
C
$240$
D
$192$

Solution

(D) Given,Cost Price $(C.P.)$ = $Rs. 240$.
Loss percentage = $20\%$.
To find the Selling Price $(S.P.)$ at a loss of $20\%$,we use the formula:
$S.P. = C.P. \times \left(1 - \frac{\text{Loss}\%}{100}\right)$
$S.P. = 240 \times \left(1 - \frac{20}{100}\right)$
$S.P. = 240 \times \left(1 - 0.20\right)$
$S.P. = 240 \times 0.80$
$S.P. = 192$
Therefore,the person should sell the article for $Rs. 192$ to incur a loss of $20\%$.
135
MediumMCQ
By selling an article for $Rs. 384$,a trader gains $20 \%$. Find the cost price of the article.
A
$160$
B
$240$
C
$320$
D
$480$

Solution

(C) Let the cost price $(C.P.)$ be $x$.
Given that the selling price $(S.P.)$ is $Rs. 384$ and the gain percentage is $20 \%$.
The formula for selling price is $S.P. = C.P. \times (1 + \frac{\text{Gain} \%}{100})$.
Substituting the values: $384 = x \times (1 + \frac{20}{100})$.
$384 = x \times (1 + 0.2) = 1.2x$.
$x = \frac{384}{1.2} = \frac{3840}{12} = 320$.
Therefore,the cost price of the article is $Rs. 320$.
136
MediumMCQ
$A$ sells an article to $B$ at a profit of $20 \%$ and $B$ sells it to $C$ at a loss of $10 \%$. If $C$ pays $Rs. 540$ for it,at what price did $A$ buy?
A
$400$
B
$500$
C
$600$
D
$700$

Solution

(B) Let the cost price for $A$ be $x$.
$A$ sells the article to $B$ at a profit of $20 \%$,so the selling price for $A$ (which is the cost price for $B$) is $x \times (1 + 0.20) = 1.2x$.
$B$ sells the article to $C$ at a loss of $10 \%$,so the selling price for $B$ (which is the cost price for $C$) is $1.2x \times (1 - 0.10) = 1.2x \times 0.9 = 1.08x$.
Given that $C$ pays $Rs. 540$,we have $1.08x = 540$.
Solving for $x$: $x = \frac{540}{1.08} = 500$.
Thus,$A$ bought the article for $Rs. 500$.
137
MediumMCQ
$A$ man sold a cow at a loss of $12 \%$. If he had sold it at a gain of $6 \%$,he would have received $₹ 72$ more. What was the cost price of the cow?
A
$300$
B
$500$
C
$400$
D
$600$

Solution

(C) Let the cost price of the cow be $CP$.
Selling price at $12 \%$ loss $= CP - 0.12 CP = 0.88 CP$.
Selling price at $6 \%$ gain $= CP + 0.06 CP = 1.06 CP$.
According to the problem,the difference between these two selling prices is $₹ 72$.
$1.06 CP - 0.88 CP = 72$.
$0.18 CP = 72$.
$CP = \frac{72}{0.18} = \frac{7200}{18} = ₹ 400$.
Therefore,the cost price of the cow is $₹ 400$.
138
EasyMCQ
An article is sold for $Rs. 4950$ at a gain of $10 \%$. What would have been the gain or loss per cent if it had been sold for $Rs. 4275$?
A
$10 \%$ gain
B
$10 \%$ loss
C
$5 \%$ gain
D
$5 \%$ loss

Solution

(D) First,calculate the Cost Price $(C.P.)$ of the article.
Given $S.P. = Rs. 4950$ and $\text{Gain} = 10 \%$.
$C.P. = S.P. \times \frac{100}{100 + \text{Gain} \%}$
$C.P. = 4950 \times \frac{100}{110} = 45 \times 100 = Rs. 4500$.
Now,if the article is sold for $S.P._{new} = Rs. 4275$.
Since $S.P._{new} < C.P.$,there is a loss.
$\text{Loss} = C.P. - S.P._{new} = 4500 - 4275 = Rs. 225$.
$\text{Loss} \% = \left( \frac{\text{Loss}}{C.P.} \right) \times 100 = \left( \frac{225}{4500} \right) \times 100 = \frac{225}{45} = 5 \%$.
Therefore,there is a $5 \%$ loss.
139
MediumMCQ
$A$ machine is sold at a profit of $15 \%$. Had it been sold for $Rs\, 540$ more,$24 \%$ would have been gained. Find the cost price.
A
$4800$
B
$5400$
C
$6000$
D
$6400$

Solution

(C) Let the cost price of the machine be $CP$.
Initially,the machine is sold at a profit of $15 \%$,so the selling price $SP_1 = CP + 0.15 CP = 1.15 CP$.
If it is sold for $Rs\, 540$ more,the new selling price $SP_2 = SP_1 + 540 = 1.15 CP + 540$.
In this case,the profit is $24 \%$,so $SP_2 = CP + 0.24 CP = 1.24 CP$.
Equating the two expressions for $SP_2$:
$1.24 CP = 1.15 CP + 540$
$1.24 CP - 1.15 CP = 540$
$0.09 CP = 540$
$CP = \frac{540}{0.09} = \frac{54000}{9} = 6000$.
Therefore,the cost price is $Rs\, 6000$.
140
EasyMCQ
$A$ person sold a radio at a loss of $5 \%$. Had he sold it for $Rs. 210$ more,he would have gained $25 \%$. For what value should he sell it in order to gain $35 \%?$
A
$645$
B
$954$
C
$654$
D
$945$

Solution

(D) Let the cost price of the radio be $CP$.
Initially,the radio is sold at a loss of $5 \%$,so the selling price $SP_1 = CP \times (1 - 0.05) = 0.95 \times CP$.
If sold for $Rs. 210$ more,the new selling price $SP_2 = SP_1 + 210 = 0.95 \times CP + 210$.
In this case,the gain is $25 \%$,so $SP_2 = CP \times (1 + 0.25) = 1.25 \times CP$.
Equating the two expressions for $SP_2$: $1.25 \times CP = 0.95 \times CP + 210$.
$0.30 \times CP = 210$,which gives $CP = \frac{210}{0.30} = 700$.
The cost price of the radio is $Rs. 700$.
To gain $35 \%$,the required selling price $SP_3 = CP \times (1 + 0.35) = 700 \times 1.35 = 945$.
Thus,the radio should be sold for $Rs. 945$ to gain $35 \%$.
141
DifficultMCQ
An article is sold at a profit of $20 \%$. If both the cost price and selling price are $Rs. 150$ less,the profit would be $5 \%$ more. Find the cost price.
A
$750$
B
$650$
C
$950$
D
$850$

Solution

(A) Let the cost price of the article be $Rs. x$.
Then,the initial selling price $= \frac{120}{100} \times x = 1.2x$.
New cost price $= Rs. (x - 150)$.
New selling price $= Rs. (1.2x - 150)$.
The new profit percentage is $20 \% + 5 \% = 25 \%$.
Using the profit formula: $\text{Profit } \% = \frac{\text{Selling Price} - \text{Cost Price}}{\text{Cost Price}} \times 100$.
$25 = \frac{(1.2x - 150) - (x - 150)}{x - 150} \times 100$.
$25 = \frac{0.2x}{x - 150} \times 100$.
$25(x - 150) = 20x$.
$25x - 3750 = 20x$.
$5x = 3750$.
$x = 750$.
Therefore,the cost price is $Rs. 750$.
142
MediumMCQ
$A$ trader sells his table at a profit of $15 \%$ and the chair at a loss of $7 \frac{1}{2} \%,$ but on the whole he gains $Rs. 50.$ If he sells the table at a loss of $7 \frac{1}{2} \%,$ and the chair at a profit of $15 \%,$ then he neither gains nor loses. Find the cost price of the table.
A
$\frac{5000}{9}$
B
$\frac{4000}{9}$
C
$\frac{4400}{9}$
D
$\frac{5300}{9}$

Solution

(B) Let the cost price of the table be $Rs. t$ and that of the chair be $Rs. c.$
According to the first condition:
$0.15t - 0.075c = 50$
Multiplying by $100$ to simplify:
$15t - 7.5c = 5000$
$15t - \frac{15}{2}c = 5000$
$30t - 15c = 10000$ $...(1)$
According to the second condition:
$-7.5t + 15c = 0$
$15c = 7.5t$
$c = \frac{7.5}{15}t = 0.5t = \frac{t}{2}$ $...(2)$
Substituting $(2)$ into $(1)$:
$30t - 15(\frac{t}{2}) = 10000$
$60t - 15t = 20000$
$45t = 20000$
$t = \frac{20000}{45} = \frac{4000}{9}$
Thus,the cost price of the table is $Rs. \frac{4000}{9}$.
143
MediumMCQ
$A$ vendor started selling vegetables at $Rs. 10$ per $kg$,but could not find buyers at this rate. So,he reduced the price to $Rs. 8.10$ per $kg$,but uses a faulty weight of $900\, g$ for $1\, kg$. Find the percent change in the actual price or loss. (in $\%$)
A
$5$
B
$10$
C
$15$
D
$20$

Solution

(B) The initial selling price was $Rs. 10$ per $kg$.
After the reduction,the vendor sells $900\, g$ for $Rs. 8.10$.
To find the actual price per $kg$ $(1000\, g)$,we calculate:
Actual price = $\frac{8.10}{900} \times 1000 = Rs. 9$ per $kg$.
The change in price is $10 - 9 = Rs. 1$.
The percentage change is $\frac{1}{10} \times 100\% = 10\%$.
144
DifficultMCQ
The cost price of $6$ pens is equal to the selling price of $4$ pens. Find the profit percent. (in $\%$)
A
$25$
B
$60$
C
$50$
D
$80$

Solution

(C) Let the cost price $(C.P.)$ of $1$ pen be $x$.
Then,the $C.P.$ of $6$ pens $= 6x$.
The selling price $(S.P.)$ of $4$ pens is given as equal to the $C.P.$ of $6$ pens,so $S.P.$ of $4$ pens $= 6x$.
Therefore,the $S.P.$ of $1$ pen $= \frac{6x}{4} = 1.5x$.
Profit on $1$ pen $= S.P. - C.P. = 1.5x - x = 0.5x$.
Profit percentage $= \frac{\text{Profit}}{C.P.} \times 100 = \frac{0.5x}{x} \times 100 = 50\%$.
145
MediumMCQ
If the cost price of $20$ tables is equal to the selling price of $25$ tables,find the loss percentage. (in $\%$)
A
$10$
B
$20$
C
$30$
D
$40$

Solution

(B) Let the cost price $(C.P.)$ of $1$ table be $x$.
Then,the $C.P.$ of $20$ tables $= 20x$.
According to the problem,the $C.P.$ of $20$ tables is equal to the selling price $(S.P.)$ of $25$ tables.
So,$S.P.$ of $25$ tables $= 20x$.
Therefore,the $S.P.$ of $1$ table $= \frac{20x}{25} = 0.8x$.
Since $S.P. < C.P.$,there is a loss.
Loss $= C.P. - S.P. = x - 0.8x = 0.2x$.
Loss percentage $= (\frac{\text{Loss}}{C.P.}) \times 100 = (\frac{0.2x}{x}) \times 100 = 20\%$.
146
DifficultMCQ
$A$ man sells an article at a loss of $5 \%$. If he had bought it at $20 \%$ more and sold it for $Rs. 115$ less,he would have made a loss of $40 \%$. Find the cost price of the article.
A
$400$
B
$450$
C
$500$
D
$600$

Solution

(C) Let the cost price of the article be $P$.
Initial selling price $(S.P._1)$ $= P \times (1 - 0.05) = 0.95P$.
If the cost price increases by $20 \%$,the new cost price $(C.P._2)$ $= P \times 1.20 = 1.2P$.
The new loss is $40 \%$,so the new selling price $(S.P._2)$ $= 1.2P \times (1 - 0.40) = 1.2P \times 0.60 = 0.72P$.
According to the problem,the difference between the two selling prices is $115$.
$S.P._1 - S.P._2 = 115$
$0.95P - 0.72P = 115$
$0.23P = 115$
$P = \frac{115}{0.23} = 500$.
Therefore,the cost price of the article is $₹ 500$.
147
MediumMCQ
When Ram sold his book for $Rs. 255$,he made a loss of $15\%$. For how much should he have sold it if he wanted to make a profit of $5\%$?
A
$275$
B
$315$
C
$295$
D
$335$

Solution

(B) Step $1$: Calculate the Cost Price $(C.P.)$ of the book.
Given that the Selling Price $(S.P.)$ is $Rs. 255$ and the loss is $15\%$.
$C.P. = S.P. \times \frac{100}{100 - \text{Loss}\%} = 255 \times \frac{100}{85} = 3 \times 100 = Rs. 300$.
Step $2$: Calculate the required Selling Price $(S.P.)$ for a profit of $5\%$.
$S.P. = C.P. \times \frac{100 + \text{Profit}\%}{100} = 300 \times \frac{105}{100} = 3 \times 105 = Rs. 315$.
148
DifficultMCQ
$A$ man invests $Rs. 21,000$ in shares of a company. He sells one-third of the total shares at a profit of $10\%$. However,he has to sell the remaining shares at a $5\%$ loss. Find his overall profit or loss percentage.
A
$10\%$ profit
B
$10\%$ loss
C
No profit,no loss
D
$5\%$ loss

Solution

(C) Total investment $(C.P.)$ $= ₹ 21,000$.
$C.P.$ of one-third of the shares $= \frac{1}{3} \times 21,000 = ₹ 7,000$.
$S.P.$ of one-third of the shares at $10\%$ profit $= 7,000 \times (1 + \frac{10}{100}) = 7,000 \times 1.1 = ₹ 7,700$.
$C.P.$ of the remaining two-thirds of the shares $= 21,000 - 7,000 = ₹ 14,000$.
$S.P.$ of the remaining two-thirds of the shares at $5\%$ loss $= 14,000 \times (1 - \frac{5}{100}) = 14,000 \times 0.95 = ₹ 13,300$.
Total $S.P. = 7,700 + 13,300 = ₹ 21,000$.
Since Total $S.P. = Total C.P. = ₹ 21,000$,there is no profit and no loss.
149
MediumMCQ
$A$ man buys $100 \, kg$ of sugar for $Rs. \, 2400$. He sold $1/4$th of the stock at a loss of $5 \%$. At what per cent profit should he sell the remaining stock so as to make an overall profit of $20 \%$ on the whole transaction? (in $\%$)
A
$25$
B
$27 \frac{1}{3}$
C
$28$
D
$28 \frac{1}{3}$

Solution

(D) Total cost price = $Rs. \, 2400$.
Total desired profit = $20 \% \text{ of } 2400 = 0.20 \times 2400 = Rs. \, 480$.
Quantity sold at $5 \% \text{ loss} = 1/4 \times 100 \, kg = 25 \, kg$.
Cost price of $25 \, kg = 1/4 \times 2400 = Rs. \, 600$.
Loss on $25 \, kg = 5 \% \text{ of } 600 = 0.05 \times 600 = Rs. \, 30$.
Remaining quantity = $100 - 25 = 75 \, kg$.
Remaining cost price = $2400 - 600 = Rs. \, 1800$.
Let the required profit percentage on the remaining stock be $P$.
Profit needed on remaining stock = $Rs. \, 480 + Rs. \, 30 = Rs. \, 510$.
$P = (510 / 1800) \times 100 = 510 / 18 = 28.33 \% = 28 \frac{1}{3} \%$.
150
DifficultMCQ
$A$ man buys $300$ dozen of bananas for $Rs. 3,600$. He sold $1/3$ of the stock at a loss of $10\%$ and the remaining $2/3$ of the stock at a gain of $10\%$. Find his overall percent profit or loss.
A
$\frac{10}{3}\%$ gain
B
$\frac{10}{3}\%$ loss
C
$\frac{14}{3}\%$ loss
D
$\frac{14}{3}\%$ gain

Solution

(A) Total cost price $(CP)$ = $Rs. 3,600$.
Cost price of $1/3$ of the stock = $\frac{1}{3} \times 3,600 = Rs. 1,200$.
Cost price of $2/3$ of the stock = $\frac{2}{3} \times 3,600 = Rs. 2,400$.
Selling price $(SP)$ of $1/3$ stock at $10\%$ loss = $1,200 \times (1 - 0.10) = 1,200 \times 0.9 = Rs. 1,080$.
Selling price $(SP)$ of $2/3$ stock at $10\%$ gain = $2,400 \times (1 + 0.10) = 2,400 \times 1.1 = Rs. 2,640$.
Total $SP = 1,080 + 2,640 = Rs. 3,720$.
Total profit = $Total SP - Total CP = 3,720 - 3,600 = Rs. 120$.
Overall profit percentage = $(\frac{Profit}{Total CP}) \times 100 = (\frac{120}{3,600}) \times 100 = \frac{1}{30} \times 100 = \frac{10}{3}\%$.
Since the result is positive,it is a gain of $\frac{10}{3}\%$.

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