Sylvia takes her car to Calebs Auto Repair Shop. A sign in the window states that all repairs must be paid for in cash unless credit is approved in advance. Sylvia and Caleb agree that Caleb will repair Sylvias car engine and put in a new transmission. No mention is made of credit. Because Caleb is not sure how much engine repair will be necessary, he refuses to give Sylvia an estimate. He repairs the engine and puts in a new transmission. When Sylvia comes to pick up her car, she learns that the bill is $2,500. Sylvia is furious, refuses to pay Caleb that amount, and demands possession of her car. Caleb insists on payment. Discuss the rights of both parties in this matter.