Delegation Of Duties And Breach Of Contract

Smith agrees to mow Brown's lawn for $25 per week. After three weeks, Smith sustains a back injury and is unable to continue. Smith asks White to take over the mowing duties and tells White he may keep the earnings. Brown agrees to allow White to mow the lawn in Smith's place. White mows Brown's lawn for two consecutive weeks, but Brown refuses to pay him. Under these circumstances, White can: