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题目材料：
Compounds $$A, B$$, and E are the only materials used to make a certain product. In this product, compounds $$A, B$$ and E are used in the ratio of 3 to 2 to 5, respectively, by weight. In 1998, what was the cost of the materials used to make one pound of this product?
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A.$1.13
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B.$1.32
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C.$1.45
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D.$1.50
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E.$1.57
B显示答案
