A.NPV=-135+35×0.909+34.25×0.826+33.5×0.751+32.75×0.683+67×0.621
B.NPV=-120+35×0.909+34.25×0.826+33.5×0.751+32.75×0.683+52×0.621
C.PI=(35×0.909+34.25×0.826+33.5×0.751+32.75×0.683+52×0.621)/120
D.P=(35×0.909+34.25×0.826+33.5×0.751+32.75×0.683+67×0.621)/135
E.不應(yīng)該購(gòu)買該設(shè)備