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Compute the payback period for each of these two separate Investments: a. A new operating system for an existing machine is expected to cost $280,000 and have a useful life of four years. The system ylelds an incremental after-tax Income of $80,769 each year after deducting its straight-line depreciation. The predicted salvage value of the system is $11,000. b. A machine costs $180,000, has a $15,000 salvage value, is expected to last eight years, and will generate an after-tax Income of $44,000 per year after straight-line depreciation. Payback Period Choose Numerator: 1 Choose Denominator: = Cost of investment Annual net cash flow S 280.000 / 180,000/ Payback Period Payback period 0 a. = b. S = 0