Thornton 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 $$19,200,000$; it will enable the company to increase its annual cash inflow by $$4,800,000$ per year. The plane is expected to have a useful life of five years and no salvage value. The second plane costs $$43,200,000$; it will enable the company to increase annual cash flow by $$7,200,000$ 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 Thornton should accept if the decision is based on the payback approach.

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

$\backslash$table$[[,$Payback Period$],[$a$-1.$ Alternative $1($First plane$),$years$],[$a$-1.$ Alternative $2($Second plane$),$years$],[$a$-2.$ Thornton should accept,$]]$