Sam orally agreed to sell his house to Humphrey. Humphrey wanted it ready for his family quickly, so he had a new roof put on, new carpeting...

Sam orally agreed to sell his house to Humphrey. Humphrey wanted it ready for hisfamily quickly, so he had a new roof put on, new carpeting installed and renovated thekitchen. Sam now thinks the place looks great and has decided not to sell. A businesslaw student told him he could do this. Can he? Explain.