Compute the payback period for each of these two separate investments a. A new operating system for an existing machine is expected to cost $270,000 and have a useful life of six years The system yields an incremental after-tax income of $77.884 each year after deducting its straight-line depreciation. The predicted salvage value of the system is $10,000 b. A machine costs $180,000, has a $14.000 salvage value, is expected to last seven years, and will generate an after-tax income of $43.000 per year after straight-line depreciation Choose Numerator: Cost of investment a $ 270,000 b $ 180,000 Payback Period 1 Choose Denominator: Annual net cash flow $ 121.217= Payback Period Payback period 223 years