选项
A.
A9.61%
B.
B9.27%
C.
C9%
D.
D8.34%
正确答案:A
名词解析
【答案】A【解析】32-5×(P/F,Kb,5)=7.53×(P/A,Kb,5),7.53×(P/A,Kb,5)+5×(P/F,Kb,5)=32,当Kb=9%时,7.53×(P/A,9%,5)+5×(P/F,9%,5)=7.53×3.8897+5×0.6499=32.5389;当Kb=10%时,7.53×(P/A,10%,5)+5×(P/F,10%,5)=7.53×3.7908+5×0.6209=31.6492,利用内插法可得:(Kb-9%)/(10%-9%)=(32-32.5389)/(31.6492-32.5389),解得:Kb=9.61%。