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Mean!

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Mean! [#permalink] New post 15 Jun 2011, 08:52
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100% (01:52) correct 0% (00:00) wrong based on 0 sessions
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
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Re: Mean! [#permalink] 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
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Re: Mean! [#permalink] 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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Re: Mean!   [#permalink] 16 Jun 2011, 00:06
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