Wages and salaries $ 21,400 Parts and supplies per Month Repair-Hour $15.00 $ 7.80 Equipment depreciation $ 2,740 $ 0.50 Truck operating expenses $ 5,730 $ 1.80 Rent $ 4,670 Administrative expenses $ 3,860 $ 0.60 For example, wages and salaries should be $21,400 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 $50.00 per repair-hour. Required: Compute the company's activity variances for May. (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.) Revenue Jake's Roof Repair Activity Variances For the Month Ended May 31 Expenses: Wages and salaries Parts and supplies Equipment depreciation Truck operating expenses Rent Administrative expenses Total expense Net operating income-