Find all School-related info fast with the new School-Specific MBA Forum

It is currently 16 Apr 2014, 23:14

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Last Sunday a certain store sold copies of Newspaper A for

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
VP
VP
Joined: 21 Mar 2006
Posts: 1136
Location: Bangalore
Followers: 2

Kudos [?]: 17 [0], given: 0

GMAT Tests User
Last Sunday a certain store sold copies of Newspaper A for [#permalink] New post 14 Jan 2007, 09:16
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

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


Got a little lost in the equations...
Director
Director
User avatar
Affiliations: FRM Charter holder
Joined: 02 Dec 2006
Posts: 736
Schools: Stanford, Chicago Booth, Babson College
Followers: 5

Kudos [?]: 14 [0], given: 4

GMAT Tests User
Re: PS - Equations [#permalink] New post 14 Jan 2007, 09:36
kripalkavi wrote:
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)


Got a little lost in the equations...


I solved it this way:

A is priced at $1, and sold 50 papers of A. Total revenue from selling A is $50.

B is priced at $1.25, and sold 40 papers of B. Total revenue from selling B is $ 50.

Lets assume that the store sold only A and B. Total revenue by selling A and B is $ 100.

That way r is 50%, and p is 500/9.

Then substituted p's value in all the options. D gave back 50% and is the answer.
Senior Manager
Senior Manager
User avatar
Joined: 24 Nov 2006
Posts: 352
Followers: 1

Kudos [?]: 10 [0], given: 0

GMAT Tests User
Re: PS - Equations [#permalink] New post 14 Jan 2007, 16:58
aurobindo wrote:
I solved it this way:

A is priced at $1, and sold 50 papers of A. Total revenue from selling A is $50.

B is priced at $1.25, and sold 40 papers of B. Total revenue from selling B is $ 50.

Lets assume that the store sold only A and B. Total revenue by selling A and B is $ 100.

That way r is 50%, and p is 500/9.

Then substituted p's value in all the options. D gave back 50% and is the answer.


I used algebra... quite lengthy for a Gmat question... same result as yours...

For A = number of A newspapers sold; similarly for B:

r/100 = A / (A + 1,25B)
p/100 = A / (A + B)

First, one finds A/B for each equation:

A/B = 1,25r / (100 - r)
A/B = p / (100 - p)

Equating both expressions to the right:

r = 400p / (500 - p) => D.

kripalkavi, could you please tell us the origin (Kaplan, OG, etc) of the question?
VP
VP
Joined: 21 Mar 2006
Posts: 1136
Location: Bangalore
Followers: 2

Kudos [?]: 17 [0], given: 0

GMAT Tests User
 [#permalink] New post 15 Jan 2007, 23:04
I tried to do it the algebrical way and got lost :( The plugging in way seems to work. I got the question from a set of 'tough' (allegedly) retired GMAT questions that a friend gave me.
  [#permalink] 15 Jan 2007, 23:04
    Similar topics Author Replies Last post
Similar
Topics:
New posts Last Sunday a certain store sold copies of Newspaper A for marine 7 05 Sep 2004, 01:04
New posts Last Sunday a certain store sold copies of Newspaper A for gamjatang 2 26 Nov 2005, 06:42
New posts Last Sunday a certain store sold copies of Newspaper A for M8 2 05 May 2006, 19:55
New posts Last Sunday a certain store sold copies of Newspaper A for ong 5 05 Aug 2006, 07:23
Popular new posts Last Sunday a certain store sold copies of Newspaper A for apollo168 10 23 Aug 2006, 06:06
Display posts from previous: Sort by

Last Sunday a certain store sold copies of Newspaper A for

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.