Exercise 9-7 (Algo) Flexible Budgets and Activity Variances [LO9-1, LO9-2] Jake's Roof Repair provided the following data concerning its costs: For example, wages and salaries should be $21,000 plus $15.00 per repair-hour. The company expected to work 3,000 repair-hou May but actually worked 2,900 repair-hours. The company expects its sales to be $45.00 per repair-hour. Required: Compute the company's activity variances for May. Note: Indicate the effect of each variance by selecting "F" for favorable, " U " for unfavorable, and "None" for no effect (i.e,, zere variance), Input all amounts as positive values