What is the payback period for a harvester that requires an average initial cash outlay of $350,000. The after-tax net cash flows from this machine will be $70,000 during the first year; $60,000 for each of the 2nd, 3rd, and 4th, years; and $30,000 for the 5th, 6th 7th and 8th years. In year eight, the machine can be sold for an after-tax salvage value of $40,000. A 2,000 square foot greenhouse building costs $24,000 to construct. This building should earn an after-tax income of $2,000 annual for its expected life of 10 years when it will have no salvage value. The cost of capital is 8 percent. Calculate the net present value