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In 1985, 45 percent of a document storage facility's 60

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In 1985, 45 percent of a document storage facility's 60  [#permalink]

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New post 07 Feb 2012, 02:18
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In 1985, 45 percent of a document storage facility's 60 customers were banks, and in 1987, 25 percent 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) \(33 \frac{1}{3}%\)
E) \(58 \frac{1}{3}%\)

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Re: In 1985, 45 percent of a document storage facility's 60  [#permalink]

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New post 07 Feb 2012, 02:39
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fiendex wrote:
In 1985, 45 percent of a document storage facility's 60 customers were banks, and in 1987, 25 percent 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) \(33 \frac{1}{3}%\)
E) \(58 \frac{1}{3}%\)


General formula for percent increase or decrease, (percent change): \(percent=\frac{Change}{Original}*100\).

Banks in 1985 - 0.45*60=27;
Banks in 1985 - 0.25*144=36;

\(percent=\frac{Change}{Original}*100=\frac{36-27}{27}*1001=\frac{1}{3}*100=33\frac{1}{3}%\)

Answer: D.
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Re: In 1985, 45 percent of a document storage facility's 60  [#permalink]

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New post 07 Feb 2012, 06:48
Bunuel wrote:
In 1985, 45 percent of a document storage facility's 60 customers were banks, and in 1987, 25 percent of its 144 customers were banks. What was the percent increase from 1985 to 1987 in the number of bank customers the facility had?

No of bank customers in 1985 = 60 x .45 = 27
No of bank customers in 1987 = 144 x .25 = 36
increase in % = 100 X 9/27 = 100/3 or 33 1/3
D is the correct answer
:)
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Re: In 1985, 45 percent of a document storage facility's 60  [#permalink]

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New post 15 Dec 2017, 05:29
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: In 1985, 45 percent of a document storage facility's 60 &nbs [#permalink] 15 Dec 2017, 05:29
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