Three ounces of cinnamon cost $2.40. If there are 16 ounces in 1 pound, how much does cinnamon cost per pound?

Three ounces cost $2.40, so each ounce costs $2.40 ÷ 3 = $0.80. A pound contains 16 ounces, so the cost per pound is 16 × $0.80 = $12.80. The correct choice is A, $12.80.

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