If x and y are positive numbers and z = xy^2, a 20 percent increase in x and a 10 percent decrease in y would result in which of the following changes in z?
Choices:
A) decrease of 2.8% B) decrease of 11.4% C) increase of 4.6% D) increase of 15.8% E) increase of 22.4%
decrease of 2.8%fter the changes, z = 1.2x*(0.9y)^2 = (1.2*0.81)xy^2 = 0.972*z   The answer is decrease of 2.8%.
<result>A</result>
If x and y are positive numbers and z = xy^2, a 20 percent increase in x and a 10 percent decrease in y would result in which of the following changes in z?