If the cost price of 30 pens is equal to the selling price of 25 pens, the gain percent is:  Answers:
A) 9%	B) 20%	C) 50%	D) 80%	E) 34%
Solution :   Let cost price of the price be Rs.1   25 pens C.P. = 25   30 pens S.P. = 30   Gain = 5/25*100= 
<gadget id="calculator">5/25*100</gadget>
<output>20</output>
20 %   Answer :20%
<result>B</result>
If the cost price of 30 pens is equal to the selling price of 25 pens, the gain percent is: