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Difficulty:
5%
(low)
Question Stats:
89% (01:07) correct
11%
(01:22)
wrong
based on 485
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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 the fund at the end of 3 months?
(A) $80
(B) $100
(C) $120
(D) $160
(E) $320
_________________
(A) $80
(B) $100
(C) $120
(D) $160
(E) $320
_________________
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Bunuel
for 6 months the amount of money in a benefit fund is doubled
Let's do backward calculation by finding previous sum by taking half of present sum
At the end of 6th Month = $640
At the end of 5th Month = $320
At the end of 4th Month = $160
At the end of 3rd Month = $80
At the end of 2nd Month = $40
At the end of 1st Month = $20
Answer: Option A
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Given
To Find
Approach and Working Out
Correct Answer: Option A
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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.
To Find
- • How much money was the fund at the end of 3 months?
Approach and Working Out
- • Let’s say, the initial amount is x then it will change as below,
- o 1st month = 2x
o 2nd month = 4x
o 3rd month = 8x
o .
o .
o 6th month = 64x.
• We know 64x = 640
- o 8x = 80
Correct Answer: Option A
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