Tough and Tricky questions: Percents.
Over the course of a year, a certain microbrewery increased its beer output by 80 percent. At the same time, it decreased its total working hours by 10 percent. By what percent did this factory increase its output per hour?	Pick:  A) 100  B) 200  C) 300  D) 400  E) 500
Lets assume the initial production was 100 litres of beer for 100 hr.   With the 80% increase the total amount of beer production will be 180 litres and with 10 % decrease in total hours will be reduced to 90 hr.   100hr ----&gt; 100 lts   1hr -----&gt; 1 lts   90hr -----&gt; 180 lts   1hr -----&gt; 2 lts   Total Increase in production for 1 hr = 200%   Answer 200
<result>B</result>
Tough and Tricky questions: Percents.
Over the course of a year, a certain microbrewery increased its beer output by 80 percent. At the same time, it decreased its total working hours by 10 percent. By what percent did this factory increase its output per hour?