NCF1-6=840×250×20×(1-25%)/10000-(0.5+3+0.5)×20×(1-25%)-10×(1-25%)+110×25%=275(万元)
NCF7-10=840x250×20×(1-25%)/10000-(1+3+0.5)x20×(1-25%)-10×(1-25%)+110×25%=267.5(万元)
(2)方案一的净现值=311.5×(P/A,12%,5)+304×(P/A,12%,3)×(P/F,12%,5)-1100=311.5×3.6048+304×2.4018×0.5674-1100=437.18(万元)
方案二的净现值=275x(P/A,12%,6)+267.5×(PA,12%,4)×(PF,12%,6)-1100=275×4.1114+267.5×3.0373×0.5066-1100=442.24(万元)
(3)方案一净现值的等额年金=437.18/(P/A,12%,8)=437.18/4.9676=88.01(万元)
永续净现值=88.01/12%=73.42(万元)
方案二净现值的等额年金=672.07/(P/A,12%,10)=442.24×5.6502=78.27(万元)
永续净现值=78.27/12%=652.25(万元)