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A book-seller buys books at a commission of 20% on the marked price. If he sells the books at the marked price, then his gain percent will be

 A book-seller buys books at a commission of 20% on the marked price. If he sells the books at the marked price, then his gain percent will be
a. 20%
b. 25% - ans
c. 10%
d. 30%
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It takes 10 days for digging a trench of 100 m long, 50 m broad and 10 m deep. What length of trench, 25 m broad and 15 m deep can be dug in 30 days ?

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