Official Guide Explanation:
Data Sufficiency #36

Background

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Solution and Metadata

Question: 36
Page: 155
Difficulty: 3 (Very Easy)
Category 1: Word Problems > Other >
Category 2: Arithmetic > Percents > other

Explanation: The find Elena's total salary and commissions, you'll either need both of those numbers, or her salary as well as her sales revenue and her commissions percentage. Statement (1) is insufficient, as it does not address her commissions. Statement (2) is insufficient, as it doesn't provide her salary or her sales revenue.

Taken together, the statements are insufficient. Without her sales revenue, it's impossible to determine her commission, without which you cannot find her total compensation. (E) is the correct choice.

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