Harrison Inc. is considering the purchase of a new rendering machine for its animation facility. The machine costs $81,000 and is expected to have a useful life of eight years, with a terminal disposal value of $21,000. The plant manager estimates the following savings in cash operating costs are expected to be $24,000 per year. However, additional working capital is needed to maintain the operations of the rendering machine. The working capital must continually be replaced, so an investment of $9,000 needs to be maintained at all times, but this investment is full recoverable (will be "cashed in") at the end of the useful life. Harrison Inc.'s require rate of return is 10%. Ignore income taxes in your analysis. Assume all cash flows occur at year-end except for initial investment amounts. Harrison Inc. uses straight-line depreciation for its machines. (Click the icon to view the present value of $1 factors.) Required (Click the icon to view the present value annuity of $1 factors.) Requirement 1. Calculate NPV. (Use factors rounded to three decimal places. Round your final answer to the nearest whole dollar. Use a minus sign or parentheses for a negative net present value.) The NPV is $ Requirement 1. Calculate NPV. (Use factors rounded to three decimal places. Round your final answer to the nearest whole dollar. Use a minus sign or parentheses for a negative net present value.) The NPV is $ Requirement 2. Calculate IRR. (Round your answer to two decimal places.) The IRR is %. Requirement 3. Calculate AARR based on net initial investment. (Round your answer to two decimal places.) The AARR based on net initial investment is %. Requirement 4. Calculate AARR based on average investment. (Round your answer to two decimal places.) The AARR based on average investment is %. Requirement 5. You have the authority to make the purchase decision. Why might you be reluctant to base your decision on the DCF methods? Choose the correct answer below