Perez Educational Services had budgeted its training service charge at $80 per hour. The company planned to provide 23,000 hours of training services during Year 3. By lowering the service charge to $70 per hour, the company was able to increase the actual number of hours to 24,900 . Required a. Determine the sales volume variance, and indicate whether it is favorable (F) or unfavorable (U). (Select "None" if there is no effect (i.e., zero variance).) b. Determine the flexible budget variance, and indicate whether it is favorable (F) or unfavorable (U). (Select "None" if there is no effect (i.e., zero variance).) c. Did lowering the price of training services increase revenue