If I purchased 11 books for Rs. 10 and sold all the books at the rate of 10 books for Rs. 11, the profit per cent is?

10%
11%
21%
100%

Correct Answer: 21%

Explanation:

Suppose I purchased 110 books
∵ C.P. = Rs. (10/11) x 110 = Rs. 100
⇒ S.P. = Rs. (11/10) x 110 = Rs. 121
∴ Gain % = 21%

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