If the cost price of 35 chocolates is equal to the selling price of 21 chocolates, the gain percent is : Choose the most appropriate option:
A) 66.55 % B) 66.66 % C) 66 % D) 55 % E) 66.33 %

Rationale: "explanation : solution : let c . p . of each chocolate be re . 1 . then , c . p . of 21 chocolates = rs . 21 ; s . p . of 21 chocolates = rs . 35 . . ' . gain % = 14 * 100 / 21 = 66.66 % answer : b"
Answer: B