折旧=(110-10)/4=25万元
NCF0=-110,NCF1=(85-20-25)*(1-25%)+25-50=5
NCF2=(85-20-25-5)*(1-25%)+25=51.25
NCF3=(85-20-25-10)*(1-25%)+25=47.5
NCF4=(85-20-25-15)*(1-25%)+25+10+50=103.75
NPV=5*(P/F,10%,1)+51.25*(P/F,10%,2)+47.5*(P/F,10%,3)+103.75*(P/F,10%,4)-110=43.4〉0
项目可行