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Average prices of laptops sold

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Intern
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Joined: 29 Sep 2009
Posts: 16
Followers: 0

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

Average prices of laptops sold [#permalink] New post 02 Oct 2009, 05:35
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A
B
C
D
E

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100% (04:14) correct 0% (00:00) wrong based on 1 sessions
Q14/ If 60% laptops A were sold at prices between $200 and $250, 30% laptops B were sold at prices between $450 and $500, 5% laptops C were sold at prices between $3,000 and $3,100. Which of the following could be the average (arithmetic mean) of the prices of all laptops sold?

A/ $240
B/ $320
C/ $410
D/ $440
E/ $510
Manager
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Joined: 30 Sep 2009
Posts: 146
Followers: 1

Kudos [?]: 18 [0], given: 0

Re: Average prices of laptops sold [#permalink] New post 02 Oct 2009, 07:38
The answer is D but I only got there through trial and error.

I found the max first, to eliminate choice E. Then I found the min. That got rid of A and B.

So I had C and D. I just adjusted one of the values to a min from a max and it came out to 440:

60 computers at 250, 30 computers at 450, and 5 computers at 3100 = an average of 440.

I'd love to see the "correct" way though!

_________________

School:
Boston College MBA '12

Re: Average prices of laptops sold   [#permalink] 02 Oct 2009, 07:38
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