Sarah Needs to Solve This Word Problem: a Sweater in a Store

question 12

Multiple Choice

Sarah needs to solve this word problem: A sweater in a store is originally priced at $40, but the price tag is marked "One-half off." The sweater is placed on a rack marked "Five dollars off the sale price." How much does the sweater cost now?
Sarah knows how to find one-half of a number; she also knows how to subtract one number from another. She uses both of these operations to arrive at the correct answer of $15. Which one of the following best describes Sarah's approach to problem solving?

• A) drawing an analogy
• B) availability
• C) working backward
• D) combining algorithms

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Definitions:

Domestic Production

The total value of all goods and services produced within a country's borders.

Imports

Goods or services brought into one country from another for sale, often subject to tariffs, quotas, and trade agreements.

International Trade

The exchange of goods and services between countries, involving exports and imports.

Quota

A government-imposed trade restriction that limits the number or monetary value of goods that can be imported or exported during a specified period.