If the cost price of 12 pens is equal to the selling price of 7 pens, the gain percent is:  Choose the correct choice from the following choices
A) 80%	B) 90%	C) 71%	D) 40%	E) 10%
Explanation:   Let C.P. of each pen be Re. 1.   Then, C.P. of 7 pens = Rs. 7; S.P. of 7 pens = Rs. 12.   Gain % = 5/7 * 100 = 71%   Answer:71%
<result>C</result>
If the cost price of 12 pens is equal to the selling price of 7 pens, the gain percent is: