The product of x and y is a constant. If the value of x is increased by 80%, by what percentage must the value of y be decreased?
Choose the correct choice from the following answers:
A) 45 %
B) 55 %
C) 35 %
D) 40 %
E) 44.44 %

Rationale: "x * y = constt . let x = y = 100 in beginning i . e . x * y = 100 * 100 = 10000 x ( 100 ) - - - becomes - - - > 1.8 x ( 180 ) i . e . 180 * new ' y ' = 10000 i . e . new ' y ' = 10000 / 180 = 55.55 i . e . y decreases from 100 to 55.55 i . e . decrease of 44.44 % answer : option e"
Answer: E