Jake's Roof Repair has provided the following data concerning its costs: For example, wages and salarles should be $20,900 plus $15.00 per repalr-hour. The company expected to work 2,500 repair-hours In May, but actually worked 2,400 repalr-hours. The company expects its sales to be $45.00 per repalr-hour. Requlred: Compute the company's activity varlances for May. (Indlcate the effect of each varlance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (I.e., zero variance). Input all amounts as positlve values.)