solve using excel an please show how

Problem 3: (25 pts) A farmer is considering replacing a labor-intensive machine system with a more capital-intensive one. Adopting the new system is estimated to increase machinery operating expenses by about $21,000 per year and to replace one hired laborer, whose annual salary is $30,000. The new machinery costs $35,000; however, the trade-in value of the old system is $12,000. Adopting the new machinery will increase annual depreciation by $4,000. Further data indicate an eight-year planning horizon, $5,000 salvage value, a 15 percent tax rate, and a 10 percent after-tax cost of capital (interest rate). Use the NPV method to evaluate the new machinery system's profitability