You are evaluating two different devices. Equipment A costs $$215,000$ and is used for a period of three years, with a pre$-$tax operating cost of $$32,000$ per year. Equipment B costs $$355,000$ and is used for six years, with a pre$-$tax operating cost of $$42,000$ per year. Both units were depreciated to book value of $0$ over the life of the unit using the linear old method of depreciation, assuming a residual value of $$20,000.$ If your tax rate is $35\%,$ the discount rate is $9\%.$ Calculate the average cost of the two machines for the year. Which machine do you prefer?Why?