(1)方案一净现值-2000+700*(P/A,10%,4)/(P/F,10%,2)=-166.19
方案二净现值-2000+[600+800*(P/A,10%,3)]/(P/F,10%,3)=-54.48
两个方案的净现值都小于0,都不应该投资,这题是不是有问题
(2)方法一净现值=-5000*[(P/A,10%,9)+1]+10000*(P/A,10%,10)/(P/F,10%,10)=-101105.15
方法二净现值{-5000*[(F/A,10%,11)-1]+10000*(P/A,10%,10)}/(P/F,10%,10)=101105.15
方法三净现值[-5000*(F/A,10%,10)*(F/P,10%,11)+10000*(F/A,10%,10)]/(P/F,10%,20)=-101105.15
由于净现值小于0,故不应该借给它