By selling an article at Rs.250, a profit of 25% is made. Find its cost price?
Answers:  A) s . 486  B) s . 455  C) s . 220  D) s . 480  E) s . 200

Rationale: "sp = 250 cp = ( sp ) * [ 100 / ( 100 + p ) ] = 250 * [ 100 / ( 100 + 25 ) ] = 250 * [ 100 / 125 ] = rs . 200 answer : e"
Answer: E