参考答案
假设投资收益率为r,则:
1×(P/F,r,1)+1×(1+10%)×(P/F,r,2)+1×(1+10%)×(1+5%)/(r-5%)×(P/F,r,2)=20
当r=10%时:
1×(P/F,r,1)+1×(1+10%)×(P/F,r,2)+1×(1+10%)×(1+5%)/(r-5%)×(P/F,r,2)=20.91
当r=12%时:
1×(P/F,r,1)+1×(1+10%)×(P/F,r,2)+1×(1+10%)×(1+5%)/(r-5%)×(P/F,r,2)=14.92
(20.91-20)/(20.91-14.92)=(10%-r)/(10%-12%)
解得:r=10.30%
由于甲公司股票的投资收益率低于必要报酬率,所以,不值得投资。