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Official Guide Explanation:Data Sufficiency #93

Background

This is just one of hundreds of free explanations I've created to the quantitative questions in The Official Guide for GMAT Quantitative Review (2nd 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: 93
Page: 159
Difficulty: 4 (Moderately Easy)
Category 1: Word Problems > Data Interpretation >

Explanation: Statement (1) is insufficient: it allows you to find the percent cancellation fee charged (35%), but not the specific day between 45 and 31 that the trip was cancelled on. Statement (2) is also insufficient: if a difference of one day would've increased the cancellation fee by \$255 (15% of \$1,700), it could be last day of the 35% period or the 50\period.

Taken together, the statements are sufficient. (1) indicates that the cancellation date was between 45 and 31 days before departure, and (2) tells us that the cancellation date was the last day before the cancellation fee increased. Thus, the cancellation date must be the 31st day before departure, so choice (C) is correct.

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