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

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If n > 0, which is greater, 20 percent of n or 10 percent of  [#permalink]

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New post Updated on: 27 Apr 2013, 04:16
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A
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  35% (medium)

Question Stats:

70% (01:29) correct 30% (01:12) wrong based on 111 sessions

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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

Originally posted by yezz on 26 Apr 2013, 13:13.
Last edited by Bunuel on 27 Apr 2013, 04:16, edited 2 times in total.
Renamed the topic and edited the question.
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Re: 20 percent of n or 10 percent of the sum of n and 0.5?  [#permalink]

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New post 26 Apr 2013, 13:52
yezz wrote:
n>0, which is greater, 20 percent of n or 10 percent of the sum of n and 0.5?
A. n<0.1
B. n>0.01


S1) n<0.1
20% of 0.1 = .02, so first option is between 0 and .02
10% of (0.1+0.5) = .06 ; 10% of (0.0+0.5) = .05, so the second option is between .05 and .06
Because the range of the second option is always larger than the range of the first option, S1 is sufficient

S2) n>0.01
20% of 0.01 = .002 so the first option is from .002 to infinity
10% of (.001+.05) = .051, so the second option is from .051 to infinity
S2 is not sufficient


I get A

Yezz, how did the OA source describe C as correct? Maybe I am missing something.
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Re: 20 percent of n or 10 percent of the sum of n and 0.5?  [#permalink]

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New post 27 Apr 2013, 03:17
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yezz wrote:
n>0, which is greater, 20 percent of n or 10 percent of the sum of n and 0.5?
A. n<0.1
B. n>0.01


I got the same answer A.

Thу question ask to find which is greatear \(0.2n\) or \(0.1(n+0.5)\). It is the same as to find which is greater \(2n\) or \(n+0.5\), or, similarly, \(n\) or \(0.5\).

(1) We definitely know that \(n<0.5\)
(2) We know nothing.

Must be A.
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Re: If n > 0, which is greater, 20 percent of n or 10 percent of  [#permalink]

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New post 27 Apr 2013, 04:41
Obviously the OA is wrong , I agree 100% on A. thanks to all the source of this question is a document i downloaded from the club that has a collection of questions in it.
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If n > 0, which is greater, 20 percent of n or 10 percent of  [#permalink]

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New post 23 Nov 2017, 05:57
If n > 0, which is greater, 20 percent of n or 10 percent of &nbs [#permalink] 23 Nov 2017, 05:57
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