Answer
Lower unit cost is $0.206/oz, so the best buy is the 14 oz box of cereal.
Work Step by Step
$\frac{2.49}{12 oz}$ = 0.208/oz
$\frac{2.89}{14 oz}$ = 0.206/oz
$\frac{3.96}{18 oz}$ = 0.220/oz
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