Please help me understand how to work this problem. Thank you

2 (20 pts] A firm has invested 530,000 in machinery with a 3year useful life. The machinery will have no salvage value, as the cost to remove it will equal its scrap value. The uniform annual benefits from the machinery are 512,000. For a combined 25% income tax rate, and 100% bonus depreciation, compute the after tax rate of return. Show clearly how you compute the aftertax cash flows