Prior to the introduction of jet ways or jet bridges, passengers usually walked along the tarmac and boarded an aircraft by climbing a set of movable stairs. Jet bridges have been installed at many airports around the world. DirectJet is considering whether to borrow money to purchase a jet bridge or to lease it from the manufacturer under an operating lease agreement. If the airline purchases the jet bridge, the cost will be $500,000. DirectJet can borrow funds for four years at