How can this be done in EXCEL? Please show all formulas!

4. Consider a piece of equipment (the challenger) that would initially cost $8,000 and has the following estimated annual expenses and MV's. MV ($) 4700 3200 2200 1450 950 600 300 0 Year, kAnnual Expenses (S) 3000 3000 3500 4000 4500 5250 6250 7750 3 4 5 6 8 If the after tax MARR is 796, determine the after-tax economic life of this equipment. MACRS (GDS) depreciation is used five-year property class). The effective income tax rate is 40%