If the cost price of 121 chocolates is equal to the selling price of 77 chocolates, the gain percent is :  Choose the correct choice from the following answers
A) 56.14 %
B) 57.44 %
C) 57.14 %
D) 56.34 %
E) 57.87 %

Rationale: "explanation : solution : let c . p . of each chocolate be re . 1 . then , c . p . of 77 chocolates = rs . 77 ; s . p . of 77 chocolates = rs . 121 . . ' . gain % = 44 * 100 / 77 = 57.14 % answer : c"
Answer: C