Following is a list of various costs incurred in producing replacement automobile parts. With respect to the production and sale of these auto parts, classify each cost as variable, fixed, or mixed. 1. Cost of labor for hourly workers 2. Factory cleaning costs, $6,000 per month 3. Hourly wages of machine operators 4. Computer chip (purchased from a vendor) 5. Electricity costs, $0.20 per kilowatt-hour 6. Metal 7. Salary of plant manager 8. Property taxes, $165,000 per year on factory building and equipment 9. Plastic 10. Oil used in manufacturing equipment 11. Rent on warehouse, $10,000 per month plus $25 per square foot of storage used 12. Property insurance premiums, $3,600 per month plus $0.01 for each dollar of property over $1,200,000 13. Straight-ine depreciation on the production equipment 14. Pension cost, $1.00 per employee hour on the job 15. Packaging