In a survey of retailers, what percent had purchased : GMAT Data Sufficiency (DS)
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# In a survey of retailers, what percent had purchased

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Manager
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17 Jan 2009, 20:00
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Question Stats:

62% (01:49) correct 38% (00:51) wrong based on 154 sessions

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In a survey of retailers, what percent had purchased computers for business purposes?

1) 85 percent of the retailers surveyed who owned their own store had purchased computers for business purposes.
2) 40 percent of the retailers surveyed owned their own store.

Official Guide 12 Question

 Question: 29 Page: 25 Difficulty: 600

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OPEN DISCUSSION OF THIS QUESTION IS HERE: in-a-survey-of-retailers-what-percent-had-purchased-134506.html
[Reveal] Spoiler: OA
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Re: DS - OG11 - Diagnostic no 29 [#permalink]

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18 Jan 2009, 03:37
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Hi Ali,

Have you considered the people who didn't own their own store but still had purchased computers for business purposes?
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Re: DS - OG11 - Diagnostic no 29 [#permalink]

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18 Jan 2009, 13:35
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Wow, talk about a dumb mistake!
Thanks.
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22 Oct 2013, 08:14
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22 Oct 2013, 08:25
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Expert's post
In a survey of retailers, what percent had purchased computers for business purposes?

Say there are total of 100 retailers.

(1) 85 percent of the retailers surveyed who owned their own store had purchased computers for business purposes. Clearly insufficient, since we don't know how many retailers own their store and also how many retailers who do NOT own a store had purchased computers for business purposes. Not sufficient.

(2) 40 percent of the retailers surveyed owned their own store. Clearly insufficient.

(1)+(2) From (2) we can answer the first question, we had in (1) but not the second question: we still don't know how many retailers who do NOT own a store had purchased computers for business purposes. Not sufficient.

To elaborate more consider the diagram below:

As you can see we can not find the value of X from the info provided.

OPEN DISCUSSION OF THIS QUESTION IS HERE: in-a-survey-of-retailers-what-percent-had-purchased-134506.html
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Re: In a survey of retailers, what percent had purchased   [#permalink] 22 Oct 2013, 08:25
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