Jake's Roof Repair has provided the following data concerning its costs; For example. wages and salaries should be $21,200 plus $15.00 per repair-hour. The company expected to work 2700 repair-hours in May, but actually worked 2,600 repair-hours. The compony expects its sales to be $47.00 per repair-hour. Required: Compute the compony's activity variapces for May. Note: Indicate the effect of each variance by selecting " F " for favorable, " U " for unfavorable, and "None" for no effect (i.e., zero variance). Input all amounts as positive values