Algebra Practice

marinajaubert
Sat, 10 Aug 2013 17:05:40 +0000

Over the last 3 months, the output of a shoe factory decreased by a total of 10 percent. If the output continued to decrease at the same rate for the next 3 months, by what percent would the output have decreased over the entire 6-month period?

A. 5%
B. 10 %
C. 19%
D. 20%
E. 21%

For this question, I know the answer is C and have looked at the working out for it but just can’t seem to understand it!! Can someone please explain this to me, I’ve been trying to figure it out for over an hour! I understand that 10% of x is x/10 but I’m not sure how the ‘plugging in’ method works for this question. Someone please help me!