The ratio between the sale price and the cost price of an article is 7:4. What is the ratio between the profit and the cost price of that article?  Choose the correct choice from the following options
A) 3 : 4  B) 1 : 2  C) 2 : 5  D) 3 : 5  E) 25

Rationale: "c . p . = rs . 4 x and s . p . = rs . 7 x . then , gain = rs . 3 x required ratio = 3 x : 4 x = 3 : 4 a"
Answer: A