BE5-1 Monthly production costs in Dilts Company for two levels of production are as Classify costs as variable, follows. fixed, or mixed. Cost 2,000 Units 4,000 Units (LO 1), C Indirect labor $10,000 $20,000 Supervisory salaries 5,000 5,000 Maintenance 4,000 6,000 Indicate which costs are variable, fixed, and mixed, and give the reason for each