Jake's Roof Repair has provided the following data concerning its costs: For example, wages and salarles should be $21,000 plus $15.00 per repair-hour. The company expected to work 2,500 repair-hours in May, but actually worked 2,400 repair-hours. The company expects its sales to be $45.00 per repair-hour. Requlred: Compute the company's activity variances for May. (Indlcate the effect of each varlance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (l.e., zero varlance). Input all amounts as positive values.)