The cost price of an article is 64% of the marked price. Calculate the gain percent after allowing a discount of 12%.  Options:
A) 37.5 % B) 38.5 % C) 42 % D) 27.5 % E) none

Rationale: "sol . let marked price = rs . 100 . then , c . p . = rs . 64 . s . p = rs . 88 . ∴ gain % = [ 24 / 64 * 100 ] % = 37.5 % . answer a"
Answer: A