Jake's Roof Repair has provided the following data concerning its costs: For example, wages and salaries should be $21, 500 plus $15.00 per repair-hour. The company expected to work 2.800 repair-hours in May, but actually worked 2, 700 repair-hours. The company expects its sales to be $47.00 per repair-hour. Required: Compute the company's activity variances for May