The cost price of an article is 55% of the marked price. Calculate the gain percent after allowing a discount of 15%. Choose the correct choice from the following choices.
A) 40.5 % B) 48.7 % C) 54.5 % D) 55.6 % % E) none

Rationale: sol . let marked price = rs . 100 . then , c . p . = rs . 55 . s . p = rs . 85 . â ˆ ´ gain % = [ 30 / 55 * 100 ] % = 54.5 % . answer c
Answer: C