Jake's Roof Repair has provided the following data concerning its costs: For example, wages and salaries should be $20.800 plus $15.00 per repair-hour. The company expected to work 2,700 repair-hours May, but actually worked 2,600 repair-hours. The company expects its sales to be $50.00 per repair-hour: Required: Compute the company's activity variances for May. (Indicote the effect of eoch voriance by selecting "F" for fovorable, "U" for unfavorable, and "None" for no effect (i.e., zero varionce). Input all amounts os positive volues.)