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percent increase or decrease

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by kanha81 » Mon May 18, 2009 4:46 pm
If x and y are positive numbers and z=x * (y^2), a 50 percent increase in x and 20 percent decrease in y would result in which of the following changes in z ?

(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%

I was able to figure out the arithmetic part, but I could not decide if it's increase or decrease? :?
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Re: percent increase or decrease

by apple100 » Mon May 18, 2009 4:56 pm
kanha81 wrote:If x and y are positive numbers and z=x * (y^2), a 50 percent increase in x and 20 percent decrease in y would result in which of the following changes in z ?

(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%

I was able to figure out the arithmetic part, but I could not decide if it's increase or decrease? :?
A. (1.5x)(0.8y)(0.8y)= 0.96z
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