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GMAT - Problem Solving (pls help to solve this) [#permalink]
23 Dec 2009, 05:30

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Difficulty:

5% (low)

Question Stats:

0% (00:00) correct
0% (00:00) wrong based on 0 sessions

Q28: Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day. If r percent of the store’s revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold were copies of newspaper A, which of the following expresses r in terms of p? A. 100p / (125 – p) B. 150p / (250 – p) C. 300p / (375 – p) D. 400p / (500 – p) E. 500p / (625 – p)

Re: GMAT - Problem Solving (pls help to solve this) [#permalink]
23 Dec 2009, 07:21

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This post received KUDOS

Let the total newspaper sold be 100.

No of Newspaper A sold = p No of Newspaper B sold = 100-p Total revenue = p*1+(100-p)*1.25 So revenue from paper A = p*1 = p Revenue percentage from paper A = (p/(p+(100-p)*1.25))*100 This is equal to r thus (p/(p+(100-p)*1.25))*100 = r

r = 100p/(125-0.25p)

by simplifying

r = 400p/(500-p)

This is hard one!!!!

gmatclubot

Re: GMAT - Problem Solving (pls help to solve this)
[#permalink]
23 Dec 2009, 07:21