The cost price of an article is 64% of the marked price. Calculate the gain percent after allowing a discount of 25%?
Options
A) 37.5 %
B) 37.6 %
C) 38.5 %
D) 17.1 %
E) 37.2 %

Rationale: "let marked price = rs . 100 . then , c . p . = rs . 64 , s . p . = rs . 75 gain % = 11 / 64 * 100 = 17.1 % . answer : d"
Answer: D