Dorothy \& George Company is planning to acquire a new machine at a total cost of $30,600. The machine's estimated life is 6 years and its estimated salvage value is $600. The company estimates that annual cash savings from using this machine will be $8,000. The company's after-tax cost of capital is 8%, and its income tax rate is 40%. The company uses straight-line depreciation (non-MACRS based). (Use Appendix C. Table 1 and ARpendix. C. Table 2) (Do not round intermediate calculations. Negative amounts should be indicated by a minus sign. Round "Payback period" to 2 decimal places and all other answers to the nearest dollar amount.) Required: 1. What is this investment's net after-tax annual cash inflow? 2. Assume that the net after-tax annual cash inflow of this investment is $5,000. what is the payback period in years? 3. Assume that the net after-tax annual cash inflow of this investment is $5,000. what is the net present value (NPV) of this investment? 4. What are the minimum net after-tax annual cost savings that make the proposed investment acceptable (ie., the doliar cost savings that would yield an NPV of \$0)