I. Payback period computation; even cash flows Compute the payback period for each of the following two separate investments (round the payback period to two decimals): 1. A new operating system for an existing machine is expected to cost $260,000 and have a useful life of five years. The system yields an incremental after-tax income of $75,000 each year after deducting its straight-line depreciation. The predicted salvage value of the system is $10,000. 2. A machine costs $190,000, has a $10,000 salvage value, is expected to last nine years, and will generate an after-tax income of $30,000 per year after straight-line depreciation