A company paid $50,000 for some research equipment, which it believes will have zero salvage value at the end of its 5-year life. Suppose that the research equipment generates net income of $24,000 over each of the five years of its life. Additionally assume that the company is subject to a combined income tax rate of 30% and that its minimum attractive rate of return is 20%. Find the after-tax net present worth and rate of return associated with this investment assuming that the research equipment is depreciated using each of the depreciation methods. Based on your results, which depreciation method would you recommend be used? In each case, assume that the company disposes of the equipment at the end of year 5 with zero salvage value.