If x and y are positive numbers and z = xy^2, a 50 percent increase in x and a 20 percent decrease in y would result in which of the following changes in z?
Choose the correct choice from the following choices
A) A decrease of 4% B) A decrease of 14% C) An increase of 4% D) An increase of 20% E) An increase of 30%
z= x*y^2   Now , since x increases by 50 % and y decreases by 20 %   z'=(3/2)x * (8/10)(8/10)y^2   = 192/200 * x*y^2   = 96/100 * x*y^2   = 96/100 * z   a decrease in 4 %   A decrease of 4%nswer A decrease of 4%
<result>A</result>
If x and y are positive numbers and z = xy^2, a 50 percent increase in x and a 20 percent decrease in y would result in which of the following changes in z?