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Official Guide Explanation:Data Sufficiency #D29

Background

This is just one of hundreds of free explanations I've created to the quantitative questions in The Official Guide for GMAT Review (12th ed.). Click the links on the question number, difficulty level, and categories to find explanations for other problems.

These are the same explanations that are featured in my "Guides to the Official Guide" PDF booklets. However, because of the limitations of HTML and cross-browser compatibility, some mathematical concepts, such as fractions and roots, do not display as clearly online.

Question: D29
Page: 24
Difficulty: 5 (Moderate)
Category 1: Arithmetic > Percents > other
Category 2: Arithmetic > Sets > 2 sets
Category 3: Word Problems > Sets >

Explanation: Statement (1) is insufficient. We don't know what fraction of retailers owned their own store, and we don't know what percentage of retailers who do not own their own store purchased computers for business purposes. Both would be necessary to answer the question in conjunction with the information given.

Statement (2) is insufficient. It doesn't tell us anything about purchasing computers for business purposes.

Taken together, the statements are insufficient. Combined, they tell us what percentage of retailers own their own store and purchased computers for business purposes. However, we don't know how many retailers who do not own their own store and purchases computers for business purposes. Choice (E) is correct.

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