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A music store has 90 different CD's. If an average price is $12 per CD

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A music store has 90 different CD's. If an average price is $12 per CD  [#permalink]

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New post 29 Sep 2011, 10:10
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

88% (01:26) correct 12% (00:23) wrong based on 17 sessions

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A music store has 90 different CD's. If an average price is $12 per CD and 20 of the most expensive ones are $20 each, what is the average price of the remaining CD's?

A. 8.33
B. 8.75
C. 9.23
D. 9.71
E. 10.07


M06-33

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Re: A music store has 90 different CD's. If an average price is $12 per CD  [#permalink]

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New post 23 Jul 2018, 22:00
shrive555 wrote:
A music store has 90 different CD's. If an average price is $12 per CD and 20 of the most expensive ones are $20 each, what is the average price of the remaining CD's?

A. 8.33
B. 8.75
C. 9.23
D. 9.71
E. 10.07


M06-33


The sum of the prices of all CD's is \(90 * $12 = $1,080\).

The sum of the prices of the most expensive CD's is $400. So, \($1,080 - $400 = $680\) is left for 70 remaining CD's. Thus the average price is \(\frac{$680}{70} = $9.71\)


Answer: D
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Re: A music store has 90 different CD's. If an average price is $12 per CD &nbs [#permalink] 23 Jul 2018, 22:00
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