The cost price of an book is 64% of the marked price. Calculate the gain percent after allowing a discount of 16%?  Choices
A) 31.25%
B) 35.5%
C) 37.5%
D) 39.5%
E) 30.5%
Let marked price = $100.   Then, C.P. = $64, S.P. = $84   Gain % = 20/64 * 100= 
<gadget id="calculator">20/64 * 100</gadget>
<output>125/4 = around 31.25</output>
31.25%. 31.25%
<result>A</result>
The cost price of an book is 64% of the marked price. Calculate the gain percent after allowing a discount of 16%?