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

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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, 07:52
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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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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, 09:34
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: 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, 23:06
increased amount = 850*4
= 200.

thus 20% of x = 200 means x = 1000 is the original rent.
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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 13 Dec 2017, 14:46
After one persons rent is increased by 20% the new mean is $850.What was original rent of friend whose rent is increased?

Doesn't the question ask for original rent?New rent after increase of 20% is 1000.

Would like some clarity, thank you
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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 13 Dec 2017, 19:51
Madhavi1990 wrote:
After one persons rent is increased by 20% the new mean is $850.What was original rent of friend whose rent is increased?

Doesn't the question ask for original rent?New rent after increase of 20% is 1000.

Would like some clarity, thank you


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

Average of money that group of 4 friends pay for rent each month is $800 --> the total amount paid by 4 friends = 4*800 = 3200.

After one persons rent is increased by 20% the new mean is $850 --> NEW total = 4*850 = 3400.

The difference = 3400 - 3200 = 200.

This amount is due to one persons rent increase by 20%, so 200 is 20% of that person's rent x*0.2 = 200 --> x = 1000 (original rent of that person was $1000 and after the increase of 20% it became $1200).

Answer: C.

Hope it's clear.
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Re: Average of money that group of 4 friends pay for rent each month is $8   [#permalink] 13 Dec 2017, 19:51
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