Question : A bookseller gives 7 books free on buying 13 books. Find the percentage of discount given to the customers.
Option 1: 25%
Option 2: 20%
Option 3: 35%
Option 4: 30%
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Correct Answer: 35%
Solution :
Let $x$ be the marked price of one book.
The selling price of 20 books = $13x$
Marked price of 20 books = $20x$
Amount discounted = $20x-13x$ = $7x$
Discount percentage = $\frac{7x}{20x}×100$ = 35%
Hence, the correct answer is 35%.
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