PSAT Math Multiple-Choice Practice Question 142
Question: 142
A college bookstore makes a profit of $0.75 for every 12 pencils it sells. Which of the following is the profit that the store makes for selling 20 pencils?
Correct Answer: C
Explanation:
C
The question asks for the profit the store makes for selling 20 pencils. Because profits increase as pencils sold increase, set up a proportion: 
. Cross-multiply to get 12x = $15. Divide both sides by 12 to get x = $1.25. The correct answer is (C).
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