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

 It is currently 04 May 2015, 17:40

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Last Sunday a certain store sold copies of Newspaper A for

Author Message
TAGS:
Manager
Joined: 29 Nov 2006
Posts: 83
Followers: 1

Kudos [?]: 3 [0], given: 0

Last Sunday a certain store sold copies of Newspaper A for [#permalink]  14 Jun 2007, 15:19
00:00

Difficulty:

(N/A)

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)
Manager
Joined: 25 May 2006
Posts: 227
Followers: 1

Kudos [?]: 21 [0], given: 0

Re: PS-newspaper [#permalink]  14 Jun 2007, 16:20
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)

D. By Plug-in numbers.

Let’s say that the number of Newspapers sold was:
A: 10
B: 40

10+40(5/4)=60

r=100/6=50/3
p=100/5=20

Then using the answers I get D.
8000/480=50/3 = r
_________________

Who is John Galt?

CEO
Joined: 17 May 2007
Posts: 2994
Followers: 59

Kudos [?]: 467 [0], given: 210

Yup agree with D. A real pain to work out though. Had to resort to back solving in the end.

Assuming A and B are equal,

Basically p = 50 % and r = 400/9% and then applying it to the answers in ABCDE.
Senior Manager
Joined: 04 Mar 2007
Posts: 442
Followers: 1

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

backsolving seems a really good approach here
Intern
Joined: 02 Jun 2007
Posts: 27
Followers: 0

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

Took me a while, but here's how to do it without backsolving:

A: Price=$1, Percent of total sales = p/100 B: Price =$1.25, Percent of total sales = (100-p)/100

Now r% of all sales came from paper A. This means

r/100 = sales from A / (sales from A + sales from B)
r/100 = (p/100)/( p/100 + 1.25*(100-p)/100)
r/100 = p/(125 -.25p)
r/100 = (4p/ [4*(125-.25p)]) ... multiply by 4/4 to get rid of decimal
r/100 = 4p / (500-p)
r = 400p / (500 -p)
Senior Manager
Joined: 03 Jun 2007
Posts: 384
Followers: 2

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

Amazing question. Adub where did u get this question from ?
Senior Manager
Joined: 04 Jun 2007
Posts: 374
Followers: 1

Kudos [?]: 22 [0], given: 0

thought it was easier to do by working out instead of backsolving-

# of newspaper A= p
# of newspaper B= 100-p

revenue from A= 1*p
revenue from B= (100-p)*1.25= 125- 1.25p
total revenue= 125- 0.25p
therefore,
r/100*(125-0.25p) = p
r= 100p/((500-p)/4)
r= 400p/500-p
Intern
Joined: 14 Mar 2005
Posts: 28
Followers: 0

Kudos [?]: 5 [0], given: 0

i plugged in r = 100 and p = 100...its an easy D
Similar topics Replies Last post
Similar
Topics:
Last Sunday a certain store sold copies of Newspaper A for 1 15 Sep 2008, 04:34
Last Sunday a certain store sold copies of Newspaper A for 10 23 Aug 2006, 06:06
Last Sunday a certain store sold copies of Newspaper A for 5 05 Aug 2006, 07:23
Last Sunday a certain store sold copies of Newspaper A for 2 05 May 2006, 19:55
Last Sunday a certain store sold copies of Newspaper A for 2 26 Nov 2005, 06:42
Display posts from previous: Sort by