respect to the production and sale of these auto parts, classify each cost as either variable, fixed, or mixed. a. Oil used in manufacturing equipment b. Plastic c. Property taxes, $165,000 per year on factory building and equipment d. Salary of plant manager e. Cost of labor for hourly workers f. Packaging g. Factory cleaning costs, $6,000 per month h. Metal i. Rent on warehouse, $10,000 per month plus $25 per square foot of storage used j. Property insurance premiums, $3,600 per month plus $0.01 for each dollar of property over $1,200,000 k. Straight-line depreciation on the production equipment I. Hourly wages of machine operators m. Electricity costs, $0.20 per kilowatt-hour n. Computer chip (purchased from a vendor) o. Pension cost, \$1.00 per employee hour on the job