Answer:
Oil used in manufacturing equipment 
Variable 
Plastic 
Variable 
Property taxes, $165,000 per year on factory building and equipment 
Fixed 
Salary of plant manager 
Fixed 
Cost of labor for hourly workers 
Variable 
Packaging 
Variable 
Factory cleaning costs, $6,000 per month 
Fixed 
Metal 
Variable 
Rent on warehouse, $10,000 per month plus $25 per square foot of storage used 
Mixed 
Property insurance premiums, $3,600 per month plus $0.01 for each dollar of property over $1,200,000 
Mixed 
Straight-line depreciation on the production equipment 
Fixed 
Hourly wages of machine operators 
Variable 
Electricity costs, $0.20 per kilowatt-hour 
Variable 
Computer chip (purchased from a vendor) 
Variable 
Pension cost, $1.00 per employee hour on the job 
Variable
Explanation:
Variable costs are cost that proportionately change with the changes in the activity base unit of production. 
Fixed cost: cost that remain constant in total dollar amount irrespective to the change in the activity base unit of production. 
Mixed cost: cost that possess characteristics of both fixed and variable costs.