Got some of it wrong if someone could help me

The Sweetwater Candy Company would like to buy a new machine that would automatically "dip chocolates. The dipping operation is currently done largely by hand. The machine the company is considering costs $160,000. The manufacturer estimates that the machine would be usable for five years but would require the replacement of several key parts at the end of the third year. These parts would cost $10,800, including installation. After five years, the machine could be sold for $5,000. The company estimates that the cost to operate the machine will be $8,800 per year. The present method of dipping chocolates costs $48,000 per year. In addition to reducing costs, the new machine will increase production by 4,000 boxes of chocolates per year. The company realizes a contribution margin of $1.40 per box. A 18% rate of return is required on all investments. Click here to view Exhibit 13B-1 and Exhibit 13B-2. to determine the appropriate discount factoris) using tables Required: 1. What are the annual net cash inflows that will be provided by the new dipping machine? Reduction in annual operating costs: 48,000 Operating costs, present hand method Operating costs, new machine Annual savings in operating costs 8,000X 40,000 5,600 45,600 Increased annual contribution margin Total annual net cash inflows 2. Compute the new machine's net present value. (Any cash outflows should be indicated by a minus sign. Round discount factor(s) to 3 decimal places and intermediate calculations to nearest dollar amount.) Purchase of machine S (160,000) 45,600x 45,600X 45,600X (10,800) Annual net cash inflows 45,600x 45,600X Salvage value of machine 5,000 50 600