PSAT Math Multiple-Choice Question 316: Answer and Explanation

Question: 316

A driving range sells golf balls in different quantities. The figure shows the costs of the various quantities. According to the figure, what is the cost of a single golf ball?

• A. $0.60
• B. $1.67
• C. $3.00
• D. $5.00

Correct Answer: B

Explanation:

B

Difficulty: Medium

Getting to the Answer: The x-axis represents the number of golf balls, so find 1 on the x-axis and trace up to where it meets the graph of the line. The y-value is somewhere between $1 and $2, so the only possible correct answer is $1.67, which is (B).

You could also find the unit rate by calculating the slope of the line using two of the points shown on the graph. The graph rises 5 units and runs 3 units from one point to the next, so the slope is , or 1.67.