Exercise 9.8 Flexible Budgets and Activity Variances (LO9-1, LO9-2] Jake's Roof Repair has provided the following data concerning its costs: Fixed cost per Month $ 21,100 Wages and salaries Parts and supplies Equipment depreciation Truck operating expenses Cost per Repair-Hour $15.00 $ 7.80 $ 0.45 $ 1.80 $ 2,760 $ 5,770 $ 4,690 $ 3.880 Administrative expenses $ 0.50 For example, wages and salaries should be $21,100 plus $15.00 per repair hour. The company expected to work 3,000 repair hours in May, but actually worked 2,900 repair-hours. The company expects its sales to be $51.00 per repair hour. Required: Compute the company's activity variances for May (Indicate the effect of each variance by selecting "F" for fivorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance). Input all amounts as positive values.)