Stan is the manager of a store that sells scooters. He helps Kenny, a 17-year-old boy, who wants to buy a $2, 500 scooter. Realizing that Kenny is so young that Kenny may lack capacity to enter into a contract, Stan refuses to sell him the scooter. Kenny then calls his dad, Stuart, and hands the phone to Stan. After Stan confirms Stuart's identity, Stuart allows Stan to record the following statement: "If my son, Kenny, does not pay the $2, 500 for the scooter, I, Stuart McCormick, will pay the full amount." Should Stan proceed with the sale of the scooter to Kenny? Why or why not? Fully discuss all legal issues relevant to making this decision.