SOLUTION: Over the course of a year, a certain factory increased its output by 90%. At the same time it decreased its total working hours by 20%. By what percent did the factory increase its

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Question 629674: Over the course of a year, a certain factory increased its output by 90%. At the same time it decreased its total working hours by 20%. By what percent did the factory increase its output per hour?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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Over the course of a year, a certain factory increased its output by 90%.
At the same time it decreased its total working hours by 20%.
By what percent did the factory increase its output per hour?
:
the increase was done by (100-20) = 80% of the workforce, therefore
.9%2F.8 * 100 = 112.5% per hr increase