Q: A college has raised 75% of the amount it needs for a new : PS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 18 Jan 2017, 22:54

### 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

# Q: A college has raised 75% of the amount it needs for a new

Author Message
Senior Manager
Joined: 04 Jan 2006
Posts: 279
Followers: 1

Kudos [?]: 37 [0], given: 0

Q: A college has raised 75% of the amount it needs for a new [#permalink]

### Show Tags

31 Jan 2007, 21:10
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 5 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Q: A college has raised 75% of the amount it needs for a new building by receiving an average donation of $60 from the people already solicited. The people already solicited represent 60% of the people the college will ask for donations. If the college is to raise exactly the amount needed for the new building, how much must the remaining people donate per person? A)$25
B) $30 C)$40
D) $50 E)$60
Senior Manager
Joined: 12 Mar 2006
Posts: 366
Schools: Kellogg School of Management
Followers: 3

Kudos [?]: 70 [0], given: 3

### Show Tags

31 Jan 2007, 21:46
75% of total (T) has been obtained from 60% of donors (total num of donors N)

0.75T => 0.6N

0.75T/0.6N = 60 => T/N = 60*0.6/0.75

Need to calculate 0.25T/0.4N

= (0.25*60*0.6)/(0.75*0.4) = 30

so B ?
VP
Joined: 09 Jan 2007
Posts: 1045
Location: New York, NY
Schools: Chicago Booth Class of 2010
Followers: 10

Kudos [?]: 161 [0], given: 3

### Show Tags

01 Feb 2007, 01:49
That is correct B is the answer.

We could also substitute some numbers, imagine there are 100 people, so:

60 contributed with $60, given 75% of total donation (D): 60x$60=75%xD D=4800
We now that the school already received 60x$60=$3600, so we need more $1200 from 40 people (100 total - 60), giving us an average of$30.
01 Feb 2007, 01:49
Display posts from previous: Sort by