please answer it step by step as i am weak in finance

show calculations as well

Q2. Estimating Project's Cash Flows: A firm is considering investing $10 million in equipment which is expected to have a useful life of four years and is expected to reduce the labor costs by $4 million per year. Assume the firm pays a 40% tax rate on accounting profits and uses the straight line depreciation method what is the after tax cash flow from the investment in year 1 through 4