PSAT Math Grid-Ins Question 72: Answer and Explanation

Question: 72

If an 8-ounce can of pineapple sells for $0.72 and a 20-ounce can costs $1.10, how many more cents does the 8-ounce can cost per ounce than the 20-ounce can? (100 cents = 1 dollar)

Correct Answer: 3.5

Explanation:

3.5

Difficulty: Easy

Getting to the Answer: Whenever you're asked for the cost of something per a set measurement, think unit rates. First, determine the price per ounce (i.e., the unit rate) for the smaller can:

Next, do the same for the larger can:

Take the difference to get $0.035, which is 3.5 cents. Pay careful attention to the way the question is worded—grid in 3.5, not .035, because the question asks how many more cents, not dollars.