19 - New equipment costing $70,000 has a five-year life and a salvage value of $20,000. It is expected to save $15,000 per year. The firm's state tax is 12%. a) Calculate the firm's combined incremental tax rate b) Calculate the after-tax cash flow (ATCF) by completing the table below using straight-line depreciation. BTCF - Before-Tax Cash Flow c) Repeat part b) using double decline balance depreciation. d) Repeat part b) using MACRS depreciation and property-class type 5