(1)甲投资回收期=15000/4200=3.57 年
乙投资回收期=4-(3800+3560+3320+3080-15000)/7840=4.16年
(2)甲净现值:4200*(P/A,10,5)-15000=4200*3.791-15000=922.2
乙净现值:3800/(1+10%)+3560/(1+10)%2+3320/(1+10%)3
+3080/(1+10%)4+7840/(1+10%)5-15000=3454.55-2942.15-2494.37-2103.68- 4868.02-15000=862.77
净现值率(现值指数)甲:6.15%,乙:5.75%
(3) 甲:内部收益率=4200*(P/A,N,5) -15000=0
3.6959