1. Office Stuff produced 15,000 file cabinets at a cost of $80,000. Production for the period was estimated at 14,000 file cabinets at a cost of $75,000. On which of the following should the flexible budget be based? a. Budgeted costs of actual production b. Budgeted costs of budgeted production c. Actual costs of budgeted production d. Actual costs of actual production