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Average of money that group of 4 friends pay for rent each month is $8

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Manager
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Joined: 11 Feb 2011
Posts: 129

Kudos [?]: 254 [0], given: 21

Average of money that group of 4 friends pay for rent each month is $8 [#permalink]

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New post 15 Jun 2011, 08:52
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

83% (01:00) correct 17% (02:23) wrong based on 29 sessions

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Average of money that group of 4 friends pay for rent each month is $800.After one persons rent is increased by 20% the new mean is $850.What was original rent of friend whose rent is increased?

A. 800
B. 900
C. 1000
D. 1100
E. 1200
[Reveal] Spoiler: OA

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Kudos [?]: 254 [0], given: 21

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Joined: 26 May 2005
Posts: 554

Kudos [?]: 244 [0], given: 13

Re: Average of money that group of 4 friends pay for rent each month is $8 [#permalink]

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New post 15 Jun 2011, 10:34
AnkitK wrote:
Average of money that group of 4 friends pay for rent each month is $800.After one persons rent is increased by 20% the new mean is $850.What was original rent of friend whose rent is increased?
A.800
B.900
C.1000
D.1100
E.1200


C

0.2X = 4(850-800)
0.2X = 200
X = 1000

Kudos [?]: 244 [0], given: 13

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Re: Average of money that group of 4 friends pay for rent each month is $8 [#permalink]

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New post 16 Jun 2011, 00:06
increased amount = 850*4
= 200.

thus 20% of x = 200 means x = 1000 is the original rent.
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Kudos [?]: 286 [0], given: 10

Re: Average of money that group of 4 friends pay for rent each month is $8   [#permalink] 16 Jun 2011, 00:06
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Average of money that group of 4 friends pay for rent each month is $8

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