if the cost price of 121 chocolates is equal to the selling price of 77 chocolates , the gain percent is :
"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"
divide(const_100, divide(77, subtract(121, 77)))