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The price of a commodity increases by 25% in January. There

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The price of a commodity increases by 25% in January. There [#permalink] New post 23 Mar 2007, 15:59
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The price of a commodity increases by 25% in January. There is a subsequent 25% increase in its price in February. If a person used to get 1 unit of the commodity for $x in December, how many units of the commodity will he get for $2x in February?
0.64x
0.36x
1.64x
1.28x
1.72x
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 [#permalink] New post 23 Mar 2007, 17:29
The commodity that cost x in Dec. cost x(5/4)^2 in Feb. so 2x would fetch
2x/((25/16)x) =32x/25x=1.28
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Re: PS Percentages [#permalink] New post 23 Mar 2007, 17:44
kyatin wrote:
The price of a commodity increases by 25% in January. There is a subsequent 25% increase in its price in February. If a person used to get 1 unit of the commodity for $x in December, how many units of the commodity will he get for $2x in February?
0.64x
0.36x
1.64x
1.28x
1.72x


If cost in Dec is X then in Feb it will be (5/4 . 5/4 . x) which is cost of 1 unit.
# units = 2/{5/4 . 5/4} = 1.28
Re: PS Percentages   [#permalink] 23 Mar 2007, 17:44
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