Joe was salesman, newly hired by Radio Hut. On the first day on the job, he was left in charge of the store while the manager and the other salesmen went to lunch. They specifically told him not to sell anything over $50 but to tell customers to comeback in an hour when they would have returned from lunch. While they were at lunch, customer came in and decided to purchase a new stereo TV set and several accessories. The total sales price was $1600, and the customer could not wait. Joe sold her the merchandise at a $400 discount. When the customer returned the next day to pick up the goods, the manager refused to go through with the deal. Explain the manager's legal obligations in these circumstances.