The ratio between the sale price and the cost price of an article is 6:5. What is the ratio between the profit and the cost price of that article?	Choose the correct answer:
A) 2 : 9
B) 1 : 5
C) 3 : 6
D) 2 : 0
E) 2 : 1

Rationale: let c . p . = rs . 5 x and s . p . = rs . 6 x . then , gain = rs . x required ratio = x : 5 x = 1 : 5 answer : b
Answer: B