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Average price

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Intern
Intern
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Joined: 29 Sep 2009
Posts: 16

Kudos [?]: 36 [0], given: 3

Average price [#permalink]

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New post 07 Oct 2009, 00:28
00:00
A
B
C
D
E

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Q.14/ If 65% 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

Kudos [?]: 36 [0], given: 3

1 KUDOS received
Director
Director
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Joined: 04 Jan 2008
Posts: 893

Kudos [?]: 765 [1], given: 17

Re: Average price [#permalink]

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New post 07 Oct 2009, 00:41
1
This post received
KUDOS
its a Weighted Average

is it D?440

I am getting 441.25

.65(225)+.30(475)+.05(3050)

andrewng wrote:
Q.14/ If 65% 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

_________________

http://gmatclub.com/forum/math-polygons-87336.html
http://gmatclub.com/forum/competition-for-the-best-gmat-error-log-template-86232.html

Kudos [?]: 765 [1], given: 17

Manager
Manager
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Joined: 18 Jul 2009
Posts: 167

Kudos [?]: 116 [0], given: 37

Location: India
Schools: South Asian B-schools
Re: Average price [#permalink]

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New post 07 Oct 2009, 04:00
good explination nitya38...OA D
_________________

Bhushan S.
If you like my post....Consider it for Kudos :-D

Kudos [?]: 116 [0], given: 37

Expert Post
Math Expert
User avatar
P
Joined: 02 Aug 2009
Posts: 5199

Kudos [?]: 5816 [0], given: 117

Re: Average price [#permalink]

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New post 07 Oct 2009, 04:25
D
max avg by taking max costs is 467.50.....lly min avg possible is 415...
only value within the range is 440 ,so the ans
_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

Kudos [?]: 5816 [0], given: 117

Senior Manager
Senior Manager
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Joined: 18 Sep 2009
Posts: 353

Kudos [?]: 600 [0], given: 2

Re: Average price [#permalink]

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New post 07 Oct 2009, 10:58
answer should be D.

65*225+30*475+5*3050 = 14625+14250+15250 =44125

44125/100 =441.25 =440

Kudos [?]: 600 [0], given: 2

Re: Average price   [#permalink] 07 Oct 2009, 10:58
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