Benson 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 $$10,000,000$; it will enable the company to increase its annual cash inflow by

$$5,000,000$ per year. The plane is expected to have a useful life of five years and no salvage value. The second plane costs

$$21,000,000$; it will enable the company to increase annual cash flow by $$7,000,000$ per year. This plane has an eight$-$year useful life

and a zero salvage value.

Required

a$1.$ Determine the payback period for each investment alternative.

a$2.$ Identify the alternative Benson should accept if the decision is based on the payback approach.

Note: Round your answers to $1$ decimal place.