r its Arizona facility. The machine costs $158,000 and is expected to have a useful life of 9 years, with a terminal disposal value of $3,000. Savings in cash operating costs are expected to be $37,500 per year. However, additional working capital is needed to keep the machine running efficiently. The working capital must continually be replaced, so an investment of Lab's required rate of return is 12%. Ignore income taxes in your analysis. Dunkin Lab plans to purchase a new centrifuge machine Present Value of $1 table Present Value of Annuity of $1 table Future Value of $1 table Future Value of Annuity of $1 table Calculate net present value. 1. Calculate internal rate of return 2. 3. Calculate accrual accounting rate of return based on net initial investment. 4. Calculate accrual accounting rate of return based on average investment. 5. You have the authority to make the purchase decision. Why might you be reluctant to base your decision on the DCF methods