If the cost price of 10 pens is equal to the selling price of 8 pens, the gain percent is:	Choose the correct choice
A) 9%
B) 25%
C) 50%
D) 80%
E) 34%
Solution :   Let cost price of the price be Rs.1   8 pens C.P. = 8   10 pens S.P. = 10   Gain = 2/8*100= 
<gadget id="calculator">2/8*100</gadget>
<output>25</output>
25 %   Answer : 25%
<result>B</result>
If the cost price of 10 pens is equal to the selling price of 8 pens, the gain percent is: