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【单选题】
企业销售甲产品,单位售价为100元,该产品单位变动成本为40元,单位固定成本为30元,则边际贡献率为( )。A.
40%
B.
60%
C.
70%
D.
30%
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B.
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A.
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B.
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C.
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D.
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