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由于本刊工作疏忽,今年第8期“长期投资决策(上)”一文中,漏印一段。即该文例数第七行后应补如下一段(原计算结果ir应等于19.7％); i_2为使净现值为负值的贴现率(较高); NPV_1为按较低贴现率计算的净现值(正值); NPV_2为按较高贴现率计算的净现值(负值) 现仍按上例有关资料,计算某投资方案的内含报酬率: 设i_1=15％,则 NPV_1=(5,000×0.870+6,000×0.756+7,000×0.658+8.000×0.572+9,000×0.497)-20,000=2.541(正值) 设i_2=20％,则NPV_2=(5,000×0.833+6,000×0.694+7,000×0.579+8.000×0.482+9,000×0.402)-20,000=(144)(负值)
Due to the negligence of the work of the journal, in the eighth issue of “Long-term investment decision (up)” in this year, it was missed. That is, after the seventh line of the number of essays, the following paragraph should be added (original calculation result ir should be equal to 19.7%); i_2 is the discount rate (higher) to make the net present value negative; NPV_1 is the net calculated at the lower discount rate Present value (positive value); NPV_2 is the net present value (negative value) calculated according to the higher discount rate Now, according to the relevant information in the above example, calculate the internal rate of return of an investment plan: Let i_1=15%, then NPV_1= (5,000×0.870+6,000×0.756+7,000×0.658+8.000×0.572+9,000×0.497)-20,000=2.541 (positive value) Let i_2=20%, then NPV_2=(5,000×0.833+6,000×0.694+7,000×0.579 +8.000×0.482+9,000×0.402)-20,000=(144) (negative value)