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题目材料：
If $$\frac{1}{2}$$ of the revenue from the sale of jazz recordings was from the sale of vocal jazz recordings, then revenue from vocal jazz recordings was approximately what fraction of revenue from all vocal recordings?
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A.$$\frac{1}{5}$$
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B.$$\frac{1}{4}$$
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C.$$\frac{1}{3}$$
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D.$$\frac{2}{5}$$
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E.$$\frac{1}{2}$$
A显示答案
