please explain how to tell if its fixed cost, mixed cost or, variable cost

Bonita Company manufactures a single product. Annual production costs incurred in the manufacturing process are shown here for two levels of production. Costs Incurred Production in Units 5,000 10,000 Production Costs Total Cost Unit Cost Total Cost Unit Cost Direct materials $8,000 $1.60 $16,000 $1.60 Direct labor 9,500 1.90 19,000 1.90 Utilities 2,000 0.40 3,300 0.33 Rent 4,000 0.80 4,000 0.40 Maintenance 800 0.16 1,400 0.14 Supervisory salaries 1,000 0.20 1,000 0.10Classify each cost above as either variable, fixed, or mixed. Production Costs Direct materials v Direct labor v Utilities Variable Cost Rent Fixed Cost Mixed Cost Maintenance Supervisory salaries 4