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A 20-oz bottle of shampoo cost $2.90. A 12-oz bottle costs $1.35. Which is the better buy?

User Ahwar
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The price of each ounce of shampoo for the 20-oz bottle is:


(2.90)/(20)=0.145.

And the price of each ounce of shampoo for the 12-oz bottle is:


(1.35)/(12)=0.1125

Answer: The 12-oz bottle is the best buy.

User Sayo Komolafe
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