1.

A man purchased 150 pens at the rate of Rs. 12 per pen. He sold 50 pens at a gain of 10%. The percentage gain at which he must sell the remaining pens so as to gain 15% on the whole outlay is = ?

A. $21\frac{1}{2}$$%
B. 0%
C. 7%
D. $17\frac{1}{2}$$%
Answer» E.


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