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Interesting GMATFix Problem-20

by arora007 » Tue Sep 21, 2010 12:58 pm
In 1978,20% of all goods sold in the USA were foreign. In 1987,25% of all goods sold in the USA were foreign. If the number of goods sold in the USA increased by 80% from 1978 to 1987, by what percentage did the total number of goods sold in the USA increase over the same period?
A)32%
B)44%
C)56%
D)65%
E)70%
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by goyalsau » Tue Sep 21, 2010 2:48 pm
is it B.
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by arora007 » Tue Sep 21, 2010 3:23 pm
OA is B you are right!
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by diebeatsthegmat » Tue Sep 21, 2010 8:38 pm
goyalsau wrote:is it B.
hey, can you explain in detail?
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by 7806 » Fri Sep 24, 2010 4:16 am
arora007 wrote:In 1978,20% of all goods sold in the USA were foreign. In 1987,25% of all goods sold in the USA were foreign. If the number of goods sold in the USA increased by 80% from 1978 to 1987, by what percentage did the total number of goods sold in the USA increase over the same period?
A)32%
B)44%
C)56%
D)65%
E)70%

all goods sold= foreign goods (F) +domestic sold goods(D).

for 78, say total(all goods sold) =100 { 20F+80D)
so, in 87, 80% increase in goods sold in USA is equal to 80% of 80 =64, so total domestic (USA goods sold)=80+64=144.

in 87 it is 44% of goods sold in 78.
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