Please show work

Superfast Burger Restaurant is considering the acquisition of a new machine that would reduce operating costs by $160,000 per year throughout its life. The machine has a cost of $480,000 and has an expected salvage value of $40,000 at the end of 4 years. For tax purposes, the restaurant plans to write off the $480,000 cost over the four-year life of the machine, using DDB, producing a tax shield from depreciation of $81, 600, $40, 800, $20, 400, and $6, 800 for years 1-4 respectively. The company has a 34 percent tax rate and using 12% interest rate. Required (Round all calculations to the nearest dollar.) Prepare a schedule computing the net present value of the company's investment in the machine