Problem 24-1A Payback period, net present value, and net cash flow calculation P1P3 Factor Company is planning to add a new product to its line. To manufacture this product, the company needs to buy a new machine at a $480,000 cost with an expected four-year life and a $20,000 salvage value. Additional annual information for this new product line follows. Required 1. Determine income and net cash flow for each year of this machine's life. 2. Compute this machine's payback period, assuming that cash flows occur evenly throughout each year. 3. Compute net present value for this machine using a discount rate of 7%