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If n > 0, which is greater, 20 percent of n or 10 percent

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Director
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If n > 0, which is greater, 20 percent of n or 10 percent [#permalink] New post 18 Jan 2005, 16:06
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A
B
C
D
E

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If n > 0, which is greater, 20 percent of n or 10 percent of the sum of n and 0.5 ?
(1) n < 0.1
(2) n > 0.01
Senior Manager
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 [#permalink] New post 18 Jan 2005, 16:16
My answer is A....because if:

0.20 > 0.10n + 0.05

then after subtraction and cross multiplication you get:

n > 1/2 but if 0.20 < 0.10n + 0.05 then n <1/2 or n = 1/2

we do not know what n could be but if it follows one those options then the choice is good. Choice 1 states that n<0.10 that also means that it is less than 1/2 which makes it the right answer choice

The second choice states that n > 0.01 but that could mean any one of those three options above so it is not sufficient.

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Last edited by greenandwise on 18 Jan 2005, 16:21, edited 1 time in total.
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 [#permalink] New post 18 Jan 2005, 16:20
can u plz explain your answer.
Thanks
s
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 [#permalink] New post 18 Jan 2005, 16:25
Sorry I edited my answer and I posted it. I hope my explanation makes sense.

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  [#permalink] 18 Jan 2005, 16:25
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