Algebra-1

Question Analysis
This question tests the student's ability to calculate the unit rate, specifically the unit price per book. The problem provides the total cost and the number of books, and the student needs to divide the total cost by the number of books to find the unit price.

Key Concept Explanation
The key concept here is the definition of a unit rate, which is the ratio of one quantity to another, expressed as a single unit of the second quantity. In this case, it is the cost per book.

Step-by-step Solution
1. Identify the quantities: Total cost = $120, Total number of books = 20
2. Calculate the unit price:

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