Ram purchases a chair at $Rs.\, 70$ and spent $Rs$. $17$ on its repair and $50$ paise on cartage. If he sold the chair at $Rs.\, 100$ then his approximate margin of profit in $\%$ will be?

Mohan buys a watch for $Rs.\,350$ and sells it for $Rs.\,392.$ Find out his percentage of profit.

If $11$ Mango are bought for $Rs.\, 10$ and sold at $10$ for $Rs.\, 11 .$ What was Gain or Loss $\% ?$

A tradesman marks his goods $30 \%$ more than the cost price. If he allows a discount of $6 \frac{1}{4} \%$ then his gain percent is

A cab driver makes a profit of $20 \%$ on every trip when he carries $3$ passengers and the price of petrol is $Rs.\,30$ a litre. Find the percentage profit for the same journey if he goes with four passengers per trip and the price of petrol reduces to $Rs.\, 24$ a litre? (in $\%$)

(Assume that revenue per passenger is the same in both the cases.)

The profit earned by selling an article for $Rs. 832$ is equal to the loss incurred when the same article is sold for $Rs. 448.$ What should be the selling price for making $50\%$ profit? (in $Rs.$)