NPV=330*(P/A,10,10%)-923.4=330*6.1446-923.4=2027.718-923.4=1104.318当NPV=0时 330*(P/A,10,IRR)-923.4=0(P/A,10,IRR)=2.7982 查表的(P/A,10,3)=2.4869 (P/A,10,4)=3.1699(3-IRR)/(3-4)=(2.4869-2.7982)/(2.4869-3.1699)IRR=3.46%