1F
解：每年折旧=1500/5=300初始现金流量（第一年）=1500每年净利润以及营业现金流量年份23456销售收入50070090011001300付现成本170170170170170折旧300300300300300所得税7.557.5107.5157.5207.5净利润22.5172.5322.5472.5622.5营业现金流量322.5472.5622.5772.5922.5终结现金流量=0净现值（NPV)=322.5*PVIF10%,2+472.5*PVIF10%,3+622.5*PVIF10%,4+772.5*PVIF10%,5+922.5*PVIF10%,6-1500=322.5*0.826+472.5*0.751+622.5*0.683+772.5*0.621+922.5*0.564-1500=546.4万回收期年份123456回收额0322.5472.5622.5772.5剩余额15001177.570582.5所以，回收期为：4+82.5/772.5=4.11年
