Algebra-1

Question Analysis
This question assesses the student's ability to interpret a real-world situation and determine the rate of change. The rate of change is given as a decrease in price for each unit sold.

Key Concept Explanation
The rate of change in a real-world context can be interpreted as the change in one quantity relative to the change in another. A negative rate of change indicates a decrease in the first quantity as the second quantity increases.

Step-by-step Solution
1. Identify the total change in price: -$20
2. Identify the total change in the number of units sold: 100 units
3. Calculate the rate of change:

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