A.23.5%~24.5% B.20.5%~21.5% C.19.0%~20

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问题 A.23.5%~24.5%B.20.5%~21.5%C.19.0%~20.0%D.17.5%~18.5%

选项 A.23.5%~24.5%
B.20.5%~21.5%
C.19.0%~20.0%
D.17.5%~18.5%

答案 C

解析 X=4500/24000=0.1875,Z=1920/8000=0.24,则Y=X/(1+X-Z)=19.79%。
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