SOLUTION: By what percent will the product of two numbers decrease if one of them is increased by 30% and the other is decreased by 30%

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Question 1060756: By what percent will the product of two numbers decrease if one of them is increased by 30% and the other is decreased by 30%
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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By what percent will the product of two numbers decrease if one of them is increased by 30% and the other is decreased by 30%
:
Two numbers A & B, whose product is AB
when A increased by 30% and B decreased by 30%, the product is:
1.3A * .7B = .91AB
then
1AB - .91AB = .09 which is 9% decrease