提問者採納: 1.(IRR-15%)/(20%-15%)=(0-6.65)/(-3.7-6.65) IRR=15%+(20%-15%)*(0-6.65)/(-3.7-6.65)=18.21% 2.假設NPV(5%)=m, NPV(10%)=n (IRR-5%)/(10%-5%)=(0-m)/(n-m) IRR=5%+(10%-5%)*(0-m)/(n-m) 一般公式是NPV(r1)
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