The cost price of an article is 25% of the marked price. Calculate the gain percent after allowing a discount of 50%.	Choose one:
A) 25 %	B) 50 %	C) 100 %	D) 150 %	E) none

Rationale: "sol . let marked price = rs . 100 . then , c . p . = rs . 25 . s . p = rs . 50 . â ˆ ´ gain % = [ 25 / 25 * 100 ] % = 100.0 % . answer c"
Answer: C