Classify each of the following costs as either variable, fixed, or mixed. Costs are from a manufacturer of portable basketball hoops.

1. Factory supervisor salary, $4,000 per month

2. Utilities, $50 per month plus $0.05 per unit produced

3. Assembly worker hourly wages

4. Factory equipment depreciation, $2,000 per month

5. Salesperson pay, $2,000 per month plus 5% of dollar sales

6. Factory insurance, $1,500 per month

7. Screws to assemble hoops

8. Factory rent, $3,000 per month

9. Metal for rims

10. Glass for backboards

11. Office salaries, $3,000 per month

12. Plastic for hoop bases