A man buys a book for ₹60 and sells it for ₹90. What is his percentage gain?

Correct option is B

Given:
Cost Price (CP) of the book = ₹60
Selling Price (SP) of the book = ₹90
Formula Used:
Profit = SP - CP
$$\text{Percentage Gain} = \left( \frac{\text{Profit}}{\text{CP}} \right) \times 100$$​​

Solution:

Profit =$$\text{SP} - \text{CP} = 90 - 60 = ₹30$$​

​$$\text{Percentage Gain} = \left( \frac{30}{60} \right) \times 100 = 50\%$$​​