Problem: the product of x and y is a constant . if the value of x is increased by 60 % , by what percentage must the value of y be decreased ?
Rationale: "x * y = constt . let x = y = 100 in beginning i . e . x * y = 100 * 100 = 10000 x ( 100 ) - - - becomes - - - > 1.6 x ( 120 ) i . e . 160 * new ' y ' = 10000 i . e . new ' y ' = 10000 / 160 = 62.5 i . e . y decreases from 100 to 62.5 i . e . decrease of 37.5 % answer : option d"
annotated_formula: multiply(subtract(const_1, divide(const_100, add(const_100, 60))), const_100)