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# ps #2 benefit fund

Author Message
CEO
Joined: 21 Jan 2007
Posts: 2734

Kudos [?]: 1076 [0], given: 4

Location: New York City

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31 May 2007, 17:41
00:00

Difficulty:

(N/A)

Question Stats:

100% (00:57) correct 0% (00:00) wrong based on 12 sessions

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Each month for 6 months the amount of money in a benefit fund is doubled. At the end of the 6 months there is a total of \$640 in the fund. How much money was in the fund at the end of 3 months?
(A) \$80
(B) \$100
(C) \$120
(D) \$160
(E) \$320

Kudos [?]: 1076 [0], given: 4

Manager
Joined: 02 May 2007
Posts: 152

Kudos [?]: 5 [0], given: 0

Re: ps #2 benefit fund [#permalink]

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31 May 2007, 18:00
bmwhype2 wrote:
Each month for 6 months the amount of money in a benefit fund is doubled. At the end of the 6 months there is a total of \$640 in the fund. How much money was in the fund at the end of 3 months?
(A) \$80
(B) \$100
(C) \$120
(D) \$160
(E) \$320

For (A)

THe amount of money at the end of the 6 months = a x 2^6 = 640
=> a = 10

=> The amount of money at the end of 3 months = a x 2^3 = 80

Kudos [?]: 5 [0], given: 0

Manager
Joined: 18 Apr 2007
Posts: 120

Kudos [?]: 5 [0], given: 0

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31 May 2007, 18:05
My way was not so pretty, but it got the same result:

1mo - x
2mo - 2x
3mo - 4x
4mo - 8x
5mo - 16x
6mo - 32x

32x=640
x=20

4(20)=80

Kudos [?]: 5 [0], given: 0

Intern
Joined: 30 May 2007
Posts: 3

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

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31 May 2007, 19:02
640 = 10*2^6

After 3 months, money should be 10*2^3 = \$80

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

31 May 2007, 19:02
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