Hawley owned a Buick, and occasionally had work down on it at the Hoff Garage. One day he drove up with a flat tire, parked his car beside the garage, and called to Hoff that he had a flat tire and would be back in an hour. Hoff fixed the flat tire. Hawley refused to pay, saying that he had intended doing the job himself. (a) Was there a contract? Explain. (b) Suppose Hoff also adjusted the carburetor and straightened a fender. Could he recover for this? Explain.