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A. 10%
B. 11%
C. 21%
D. 100%

Explanation:

Suppose I Purchased 110 books

C.P = Rs. (10/11 × 110) = Rs. 100

S.P = Rs. (11/10 × 110) = Rs. 121

Gain % = 21%

Correct Answer: 21%

Last Updated: February 07, 2020