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Cost Behavior Variable Fixed To Units of Product Direct Indirect Cost Item 1. Plastic washers used to assemble autos* 2. Production superintendent's salary 3. Wages of workers who assemble a product 4. Electricity to run production equipment 5. Janitorial salaries 6. Clay used to make bricks 7. Rent on a factory building 1 8. Wood used to make skis 9. Screws used to make furniture* 10. A supervisor's salary 11. Cloth used to make shirts 12. Depreciation of cafeteria equipment 13. Glue used to make textbooks* 14. Lubricants for production equipment 15. Paper used to make textbooks *These materials would usually be considered indirect materials because their costs are relatively insignificant. It would not be worth the effort to trace their costs to individual units of product and therefore they would usually be classified as indirect materials