Rooney airline company is considering expanding its territory. the company has the opportunity to purchase one of two different used airplanes. the first airplane is expected to cost $16,250,000; it will enable the company to increase its annual cash inflow by $6,500,000 per year. the plane is expected to have a useful life of five years and no salvage value. the second plane costs $37,840,000; it will enable the company to increase annual cash flow by $8,600,000 per year. this plane has an eight-year useful life and a zero salvage value. required determine the payback period for each investment alternative and identify the alternative rooney should accept if the decision is based on the payback approach.