The cost price of an article is 64% of the marked price. Calculate the gain percent after allowing a discount of 15%?	Select.
A) 32.8 %  B) 37.6 %  C) 38.5 %  D) 17.5 %  E) 37.2 %

Rationale: "let marked price = rs . 100 . then , c . p . = rs . 64 , s . p . = rs . 85 gain % = 21 / 64 * 100 = 32.8 % . answer : a"
Answer: A