A–1 Roofing Co. entered into a written contract with Jaffe to put a new roof on the latter’s residence for $1,800, using a specified type of roofing, and to complete the job without unreasonable delay. A–1 undertook the work within a week thereafter, but when all the roofing material was at the site and the labor 50 percent completed, the premises were totally destroyed by fire caused by lightning. A–1 submitted a bill to Jaffe for $1,200 for materials furnished and labor performed up to the time of the destruction of the premises. Jaffe refused to pay the bill, and A–1 now seeks payment from Jaffe. Should A–1 prevail? Explain.