If the cost price of 12 pens is equal to the selling price of 6 pens, the gain percent is: Choose the correct choice from the following options
A) 80%	B) 90%	C) 100%	D) 40%	E) 10%
Explanation:   Let C.P. of each pen be Re. 1.   Then, C.P. of 6 pens = Rs. 6; S.P. of 6 pens = Rs. 12.   Gain % = 6/6 * 100= 
<gadget id="calculator">6/6 * 100</gadget>
<output>100</output>
100%   Answer:100%
<result>C</result>
If the cost price of 12 pens is equal to the selling price of 6 pens, the gain percent is: