Jake's Roof Repair has provided the following data concerning its costs: For example, wages and salaries should be $21,400 plus $15.00 per repair-hour. The company expected to work 2,600 repair-hours ir May, but actually worked 2,500 repair-hours. The company expects its sales to be $52.00 per repair-hour. Required: Compute the company's activity variances for May. (Indleate the effect of each varlance by selectling "F" for fovorable, "U" for unfavorable, and "None" for no effect (l.e., zero varlance). Input all amounts as positlve values.)