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设投资收益率为r,则
20=1×(P/F,r,1)+1×(1+10%)×(P/F,r,2)+1×(1+10%)×(1+5%)/(r-5%)×(P/F,r,2)
即:20=1×(P/F,r,1)+1.1×(P/F,r,2)+1.155/(r-5%)×(P/F,r,2)
20=1×(P/F,r,1)+[1.1+1.155/(r-5%)]×(P/F,r,2)
当r=10%时,1×(P/F,r,1)+[1.1+1.155/(r-5%)]×(P/F,r,2)=20.908
当r=12%时,1×(P/F,r,1)+[1.1+1.155/(r-5%)]×(P/F,r,2)=14.924
利用内插法可知:
(20.908-20)/(20.908-14.924)=(10%-r)/(10%-12%)
解得:r=10.30%
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