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某工艺设备原方案的投资额为10万元，经营成本为4.5万元，新方案的投资额为14万元，经营成本为3万元，则增量投资收益率为（　　）。[2010年真题]

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A、26.1％

B、26.7％

C、37.5％

D、23.6％

参考答案:

C

该新方案的增量投资收益率R（2－1）＝（C1－C2）/（I2－I1）×100％＝（4.5－3）/（14－10）×100％＝37.5％。

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