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A certain group of car dealerships agreed to donate x dollar

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A certain group of car dealerships agreed to donate x dollar [#permalink]

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New post 21 Feb 2011, 00:36
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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) Sixty more cars were sold than expected, so that the total amount actually donated was $28,000

a) as 500 are expected to be sold and x dollars are expected to be donated for each car => Expected donation will be 500x .
sufficient

b) it is giving the actual amount donated but we need expected donation amount NS

But this is wrong
[Reveal] Spoiler: OA

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Re: X dollars donated for each car sold to Red Cross [#permalink]

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New post 21 Feb 2011, 00:46
GMATD11 wrote:
92)

a) as 500 are expected to be sold and x dollars are expected to be donated for each car => Expected donation will be 500x .
sufficient


Whenever 500x is written; the exact value is not known.
The question asks for exact dollar value.

Say; the dealership is donating $1 for every car they are expecting to sell; it would donate $500
Say; the dealership is donating $2 for every car they are expecting to sell; it would donate $1000

Thus Not sufficient.

b) it is giving the actual amount donated but we need expected donation amount NS
True.

But this is wrong



Combing both; 500 car was expected to be sold; it actually sold 560 cars;

Donated; 28000 for 560 cars
Donated per car;
28000/560 = $50

It was expecting to donate; 500*50=25000
Sufficient.

Ans: "C"
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Re: X dollars donated for each car sold to Red Cross [#permalink]

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New post 21 Feb 2011, 00:47
From statement 1, total expected donation is 500x, insufficient as we do not know x
From Statement 2, if initial expectation was to sell N cars then (N+60)*x = 28000, we need to find amount expected to be donated which is N*x, but we cant determine that if we do not know x, so insufficient.
Combining 1 and 2, we know N = 500,
so, (560)*x = 28000 or x =28000/560 = 50 hence expected amount = 500*50 = 25000, Sufficient
Answer C

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Re: X dollars donated for each car sold to Red Cross [#permalink]

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New post 21 Feb 2011, 01:53
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GMATD11 wrote:
92) 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?

a) A total of 500 cars were expected to be sold
b) Sixty more cars were sold than expected, so that the total amount actually donated was $28,000

a) as 500 are expected to be sold and x dollars are expected to be donated for each car => Expected donation will be 500x .
sufficient

b) it is giving the actual amount donated but we need expected donation amount NS

But this is wrong


Official Guide:

In data sufficiency problems that ask for the value of a quantity, the data given in the statements are sufficient only when it is possible to determine exactly one numerical value for the quantity.

Statement (1) gives us the expression with unknown (500x) rather than single numerical value for the quantity thus it's not sufficient.

Hope it's clear.
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A certain group of car dealerships agreed to donate x dollar [#permalink]

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New post 11 Apr 2012, 12:36
A certain group of car dealerships agreed to donate x dollars to Red Cross chapter for each car sold during the 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$


I came with E and was wrong
My point was that the first statement doesn't tell us that the plan to sold 500 cars was established for the 30day period. Just in general to sell 500 cars
Please - what can't i grasp here - could someone tell me?

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Re: A certain group of car dealerships agreed to donate x dollar [#permalink]

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New post 11 Apr 2012, 17:28
Hi,

This is how I broke it down & I think I did fall for the trap answer e.

Statement 1: expected cars to be sold = 500 Not Sufficient as donation amt nt given

Statement 2 :( expected cars + 60 cars) x donation per car = 28000
Not sufficient

Combined 560 x donation per car = 2800

Hence sufficient

We miss that its expected cars + 60 & not actual cars + 60

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Re: A certain group of car dealerships agreed to donate x dollar [#permalink]

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New post 11 Apr 2012, 22:03
Guys
i understand that the question is pretty simple )
but i used to think data can be sufficient only if it gives us necessary information
I read the first statement as "500 cars will be sold in general, not during the month, within which the agreement took place".
Otherwise it should be written " A total of 500 cars were expected to be sold within the 30 day period"
Anyway, C is correct, and I must to go w it

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Re: A certain group of car dealerships agreed to donate x dollar [#permalink]

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New post 12 Apr 2012, 04:22
Hi Gailiya,

I understand your point. I had a similar problem with another question. Go to think link and have a look:

all-the-clients-that-company-x-had-at-the-beginning-of-last-128023.html


Sometimes, GMAT questions expect us to assume that certain information is understood. I personally feel such GMAT questions are flawed.


Hope this helps.
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Re: A certain group of car dealerships agreed to donate x dollar [#permalink]

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New post 12 Apr 2012, 04:28
Thank you, Naina!
will try to figure out such a flaws )

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Re: A certain group of car dealerships agreed to donate x dollar [#permalink]

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New post 12 Apr 2012, 06:32
Galiya wrote:
A certain group of car dealerships agreed to donate x dollars to Red Cross chapter for each car sold during the 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$


I came with E and was wrong
My point was that the first statement doesn't tell us that the plan to sold 500 cars was established for the 30day period. Just in general to sell 500 cars
Please - what can't i grasp here - could someone tell me?


Missed the key words Expected & Actual...

Went with E, but C is the correct answer
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Re: A certain group of car dealerships agreed to donate x dollar [#permalink]

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New post 02 Jul 2013, 01:59
Is the answer when combined 25000?

Let n be the total number of cars and X be the amount

Statement 1

Gives us n = 500, X = ?

we dont' know X not sufficient

Statement 2

(n+60) X = 28000

Not sufficient

Combined

560 X = 28000

X = 50

Nx = 500 * 50 >> 25000

Sufficient C
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Re: A certain group of car dealerships agreed to donate x dollar [#permalink]

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Re: A certain group of car dealerships agreed to donate x dollar   [#permalink] 07 Dec 2017, 13:47
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