Official Guide Explanation:
Data Sufficiency #138

Background

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Solution and Metadata

Question: 138
Page: 285
Difficulty: 5 (Moderate)
Category 1: Word Problems > Other >
Category 2: Algebra > Equations >

Explanation: To know the total amount of revenue, you need to know how many of the tickets were full price, how many were half price, and the cost of each type of ticket. Statement (1) is insufficient, as it only gives you the discount rate of the discount tickets. Statement (2) is also insufficient, as it only gives you the price of full - price tickets.

Taken together, there still isn't enough information. While you can find the price of each type of ticket, you don't know how many of each type of ticket were sold. The correct choice is (E).

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