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percentage change

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by kaf » Thu Mar 26, 2009 5:27 am
Can someone please explain the solution to this problem for me

In 1985, 45% of a document storage facility's 60 customers were banks, and in 1987, 25% of its 144 customers were banks. What was the percent increase from 1985 to 1987 in the number of bank customers the facility had?

A. 10.7%
B. 20%
C. 25%
D. 33/1/3%
E. 58/1/3%

Thanks
Last edited by kaf on Thu Mar 26, 2009 9:09 am, edited 1 time in total.
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Source: — Problem Solving |

by scoobydooby » Thu Mar 26, 2009 6:05 am
i guess the question should read "percentage decrease" instead of "percentage increase.

1985: banks: 45/100*60=27
1987: banks: 25/100*60=15
% decrease: (27-15)/27*100=44.44%
Last edited by scoobydooby on Thu Mar 26, 2009 6:42 am, edited 1 time in total.
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by kaf » Thu Mar 26, 2009 6:17 am
Its percentage increase. I saw this question in the old GMAT Powerprep
and the OA they gave there was D. 33/1/3
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Re: percentage change

by scoobydooby » Thu Mar 26, 2009 6:38 am
kaf wrote: In 1985, 45% of a document storage facility's 60 customers were banks, and in 1987, 25% of its ......customers were banks. What was the percent increase from 1985 to 1987 in the number of bank customers the facility had?
guess we are missing something here. are you sure the problem did not have any value between "its and customers"?
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by kaf » Thu Mar 26, 2009 9:10 am
Sorry about this

there is the figure 144 so i have edited the question

thanks
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by chetanojha » Thu Mar 26, 2009 1:25 pm
1985 => 45% of 60 =27
1987 => 25% of 144=37

Total Increase between 1998-1987=36-27=9

%Increase=9/27=1/3=33.33%
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by kaf » Sat Mar 28, 2009 4:28 pm
chetanojha wrote:1985 => 45% of 60 =27
1987 => 25% of 144=37

Total Increase between 1998-1987=36-27=9

%Increase=9/27=1/3=33.33%
chetanojha thanks a lot for the solution but i think there are a few typo errors so i have corrected it below

1985 => 45% of 60 =27
1987 => 25% of 144=36

Total Increase between 1985-1987=36-27=9

%Increase=9/27=1/3=33.33%
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by chetanojha » Wed May 13, 2009 5:29 am
kaf wrote:chetanojha thanks a lot for the solution but i think there are a few typo errors so i have corrected it below

1985 => 45% of 60 =27
1987 => 25% of 144=36

Total Increase between 1985-1987=36-27=9

%Increase=9/27=1/3=33.33%
Thanks. I think I got little excited.
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