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

 It is currently 27 May 2015, 22:38

### 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 september the sales total for a certain car dealership

Author Message
TAGS:
Intern
Joined: 05 Apr 2008
Posts: 24
Followers: 0

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

Last september the sales total for a certain car dealership [#permalink]  31 Aug 2008, 17:45
Last september the sales total for a certain car dealership was 400% greater than the average (arithmetic mean) monthly sales total for the other 11 months of the year. The sales total for September was approximately what percent of the year's sales?

a) 15%
b) 27%
c) 31%
d) 42%
e) 75%
Current Student
Joined: 11 May 2008
Posts: 562
Followers: 7

Kudos [?]: 56 [0], given: 0

Re: Math Question [#permalink]  31 Aug 2008, 19:26
such problems are best done , by plugging

let every month sale or average sale per month (for 11 months) be 1 car / month.
so sale in september = 400% of monthly avg ... sorry 400% greater ( notice the difference) this is where we make mistakes.
= (400/100)+1 = 5 times avg monthly sale
so sep sale/ total yr sale= 5/16 = (3 and something) %. from the ans , only C matches.
SVP
Joined: 29 Aug 2007
Posts: 2496
Followers: 58

Kudos [?]: 563 [0], given: 19

Re: Math Question [#permalink]  31 Aug 2008, 19:29
HVD1975 wrote:
Last september the sales total for a certain car dealership was 400% greater than the average (arithmetic mean) monthly sales total for the other 11 months of the year. The sales total for September was approximately what percent of the year's sales?

a) 15%
b) 27%
c) 31%
d) 42%
e) 75%

11 moth avg = x
11 month total = 11x
sept = 400% of x + x = 5x
sept/totoal = =5x/(11x+5x) = =31%
_________________
SVP
Joined: 07 Nov 2007
Posts: 1828
Location: New York
Followers: 29

Kudos [?]: 552 [0], given: 5

Re: Math Question [#permalink]  31 Aug 2008, 21:17
HVD1975 wrote:
Last september the sales total for a certain car dealership was 400% greater than the average (arithmetic mean) monthly sales total for the other 11 months of the year. The sales total for September was approximately what percent of the year's sales?

a) 15%
b) 27%
c) 31%
d) 42%
e) 75%

5x/11x+5x = 5/16 = 31%
_________________

Smiling wins more friends than frowning

Re: Math Question   [#permalink] 31 Aug 2008, 21:17
Similar topics Replies Last post
Similar
Topics:
A certain car dealership sells economy cars, luxury cars 4 03 Jul 2014, 06:49
9 In a network of car dealerships, a group of d sales director 11 22 Apr 2013, 20:57
At the beginning of the last year, a car dealership had 150 8 30 Apr 2010, 09:44
If every car sold last week at a certain used-car dealership 4 31 Dec 2005, 04:22
A certain car dealership has two locations. Last month, an 7 22 Jun 2005, 16:15
Display posts from previous: Sort by