折旧=(550-40)/10=51NCF0=-550NCF1=0NCF2=-100NCF3-11=(380-129)*(1-33%)+51*33%=185NCF12=185+40+100=325NPV=185*[(P/A,10%,11)-(P/A,10%,2)]+325*(P/F,10%,12)-550-100(P/F,10%,2)NPVR=NPV/[550+100(P/F,10%,2)]PI=NPVR+1