If the cost price of 65 chocolates is equal to the selling price of 50 chocolates, the gain percent is :	Choose the correct choice from the following answers: A) 35 % B) 10 % C) 20 % D) 30 % E) 33 %

Rationale: "explanation : solution : let c . p . of each chocolate be re . 1 . then , c . p . of 50 chocolates = rs . 50 ; s . p . of 50 chocolates = rs . 65 . . ' . gain % = 15 * 100 / 50 = 30 % answer : d"
Answer: D