If the cost price of $12$ pens is equal to selling price of $8$ pens, find the gain percent.
$25$
$33$
$50$
$66 \frac{2}{3}$
A man sells a scooter to his friend at $10 \%$ loss. If the friend sells it for $RS.\, 4000$ and gains $20\%,$ find out the original cost price of the scooter. (in $Rs.$)
When a plot was sold for $Rs$ $18700,$ the owner lost $15 \% .$ At what price must the plot be sold in order to gain $15 \% ?$
When a producer allows $36 \%$ concession on the retail price of his product, he earns a profit of $8.8 \% .$ What would be his profit percent if the commission is reduced by $24 \% ?$
On selling an article for $Rs.\, 500$ the loss incurred is $20 \% .$ To make a profit of $20 \%$ the article must be sold at in $Rs.$?
A man sold his two horses for $Rs.\, 770$ each, on one he gained $10$ $\%$ $\&$ on the other he lost $10 \% .$ The average gain or loss percentage is