Final answer:
The profit made from purchasing a book at ₹120 and selling it at ₹150 is ₹30, which translates to a profit percent of 25%.
Step-by-step explanation:
The calculation of profit percent is made by finding the difference between the selling price and the purchasing price, and then comparing that profit to the purchasing price. In this case, the book was purchased for ₹120 and sold for ₹150.
First, we need to determine the profit in rupees:
Profit = Selling Price - Purchase Price
= ₹150 - ₹120
= ₹30
Then, we calculate the profit percent:
Profit Percent = (Profit / Purchase Price) x 100
= (₹30 / ₹120) x 100
= 25%
So, the profit percent on the book is 25%.