Sally Omar is the manager of the office products division of Wallace Enterprises. In this position, her annual bonus is based on an appraisal of return on investment (ROI) measured as Division income ÷ End-of-year division assets (net of accumulated depreciation). Sally does not receive a bonus unless ROI is 9 percent or higher. Currently, Sally is considering investing $40,000,000 in modernization of the division plant in Tennessee. She estimates that the project will generate cash savings of $7,500,000 per year for 8 years. The plant improvements will be depreciated over 8 years ($40,000,000 ÷ 8 = $5,000,000). Thus, the annual effect on income will be 2,500,000 ($7,500,000 - $5,000,000). 

Required 

Using a discount rate of 10 percent, calculate the NPV of the modernization project. Then calculate the ROI of the project each year over its eight-year life. (Calculate ROI as effect on income divided by end-of-year book value. Note that the value of ROI is not defined at the end of year 8 when book value is zero.) Finally, write a paragraph explaining why Sally may not make the investment even though it has a positive NPV.