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Cold Duck Manufacturing Inc. is a company that produces iWidgets, among several other products. Suppose that Cold Duck Manufacturing Inc. considers replacing its old machine used to make iWidgets with a more efficient one, which would cost $1,700 and require $380 annually in operating costs except depreciation. After-tax salvage value of the old machine is $700, while its annual operating costs except depreciation are $1,000. Assume that, regardless of the age of the equipment, Cold Duck Manufacturing Inc.'s sales revenues are fixed at $4,500 and depreciation on the old machine is $700. Assume also that the tax rate is 40% and the project's risk-adjusted cost of capital, r, is the same as weighted average cost of capital (WACC) and equals 10%. Based on the data, net cash flows (NCFs) before replacement are years , and they are constant over four Although Cold Duck Manufacturing Inc.'s NCFs before replacement are the same over the four-year period, its NCFs after replacement vary annually. The following table shows depreciation rates over four years Year 1 Year 2 Year 3 Year 4 Depreciation rates 33.33% 44.45% 14.81% 7.41%