Interesting GMATFix Problem-20

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arora007: Community Manager; Posts: 1048; Joined: Mon Aug 17, 2009 3:26 amFollowed by: 27 members; Location: India; Thanked: 51 times; GMAT Score:670

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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Source: Beat The GMAT — Problem Solving | Tue Sep 21, 2010 12:58 pm

goyalsau: Legendary Member; Posts: 866; Joined: Mon Aug 02, 2010 6:46 pm; Location: Gwalior, India; Thanked: 31 times

by goyalsau » Tue Sep 21, 2010 2:48 pm

is it B.

arora007: Community Manager; Posts: 1048; Joined: Mon Aug 17, 2009 3:26 amFollowed by: 27 members; Location: India; Thanked: 51 times; GMAT Score:670

by arora007 » Tue Sep 21, 2010 3:23 pm

OA is B you are right!

diebeatsthegmat: Legendary Member; Posts: 1119; Joined: Fri May 07, 2010 8:50 amFollowed by: 3 members; Thanked: 29 times

by diebeatsthegmat » Tue Sep 21, 2010 8:38 pm

goyalsau wrote:is it B.

hey, can you explain in detail?

7806: Senior | Next Rank: 100 Posts; Posts: 45; Joined: Tue Aug 03, 2010 1:10 am

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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