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

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) (Show Source): You can put this solution on YOUR website!
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
* 100 = 112.5% per hr increase
RELATED QUESTIONS
A plane flew 480 miles at a certain speed; and then increased its speed by 20 miles per... (answered by rwm)

This was originally a test question that I tried to figure out. The answer is 160 miles... (answered by scott8148,ptaylor)

In a certain factory, three machines A, B and C produce the same product. The machines A... (answered by richwmiller)

The output of a particular producing oil well decreases at the continuous rate of 12% per (answered by ewatrrr)

The output of a particular producing oil well decreases at the continuous rate of 14% per (answered by ewatrrr)

A manufacturer of furniture increased its monthly output of 500 chairs by 20%. What is... (answered by gonzo)

a bond that sold for $2490 decreased 33 1/3 in value by the end of the year. What is its... (answered by josmiceli)

Sales reduction force a factory to cut back its output by 20%. By what percent must the... (answered by prince_abubu)

A cruise ship sailed through a 30-mile inland passageway at a constant rate before its... (answered by Boreal)