Mia can purchase a 40-ounce jar of peanut butter for $5.20 or a 15-ounce jar for $2.70. How much does Mia save per ounce by buying the 40-ounce jar?
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Answer:
520 cents/40 ounces = 13 cents per ounce
270 cents/15 ounces = 18 cents per ounce
18-13 = 5 cents ($0.05) saved per ounce
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