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If a commission of 10% is given on the marked price of a book, the publisher gains 20%. If the commission is increased to 15% the gain is :

A. 16.67%
B. 13.33%
C. 15.17%
D. 17%
E. 10.5%
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সঠিক উত্তরঃ B. 13.33%
Explanation: