Charles Sanarwari retained Stan Gissel to prepare his income tax return for the year $2014.$ The parties agreed on a fee of $$400.$ Charles had done a rough estimate based on last year$$s return and believed he would owe the IRS approximately $$2,000.$ When Stan$$s work was completed, it turned out that Charles would receive a $$2,321$ tax refund. Charles paid for Stan$$s services and was so pleased with the work that he promised to pay Stan an additional $$400$ for the excellent job on the tax return when he received his tax refund. Thereafter, Charles had a falling out with Stan over a golf tournament snub. Stan was not paid the $$400$ promised for doing an excellent job on the tax return, and he sued Charles as a matter of principle. Decide