EX 19-1 Classify costs OBJ. 1 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 either variable, fixed, or mixed. 1. Oil used in manufacturing equipment 2. Plastic 3. Property taxes, $165,000 per year on factory building and equipment 4. Salary of plant manager 5. Cost of labor for hourly workers 6. Packaging 7. Factory cleaning costs, $6,000 per month 8. Metal (Continued)