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# GMAT Prep: Car Dealerships

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Manager
Joined: 26 Dec 2007
Posts: 70

Kudos [?]: 25 [0], given: 0

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17 Feb 2008, 19:32
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Question Stats:

50% (02:19) correct 50% (00:00) wrong based on 3 sessions

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A certain group of car dealerships agreed to donate x dollars to a Red Cross chapter for each car sold during a 30-day period. What was the total amount that was expected to be donated?

1) A total of 500 cars were expected to be sold
2) 60 more cars were sold than expected, so that the total amount actually donated was \$28,000

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Director
Joined: 30 Jun 2007
Posts: 781

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Re: GMAT Prep: Car Dealerships [#permalink]

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17 Feb 2008, 19:43
In order to compute the total donation amount, we need two things:1.X and 2.Total number of cars.

1) Total of 500 cars sold. Fine! But, we don’t know x, so donation amount cannot be computed. (Not Sufficient)
2) Let N be total number of cars: (N + 60)X = 28000
Again we don’t have N and X – Not Sufficient

Combine 1) and 2)
560 * X = 28000
X = 2800 / 56 = 50

Total Contribution = 25000.

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Director
Joined: 30 Nov 2006
Posts: 591

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Location: Kuwait
Re: GMAT Prep: Car Dealerships [#permalink]

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19 Feb 2008, 13:04
A certain group of car dealerships agreed to donate x dollars to a Red Cross chapter for each car sold during a 30-day period. What was the total amount that was expected to be donated?

y: number cars expected
x: donated dollars per car
z: actual number of cars sold

Want: xy = ?

1) A total of 500 cars were expected to be sold
----------------------------------------------
y = 500

insufficient

2) 60 more cars were sold than expected, so that the total amount actually donated was \$28,000
--------------------------------------------------------------------------------------------------
z = 60 + y
xz = 28,000
x(60+y) = 28,000

insufficient

Kudos [?]: 314 [0], given: 0

Re: GMAT Prep: Car Dealerships   [#permalink] 19 Feb 2008, 13:04
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