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E5.4 (LO 1), C Family Furniture Corporation incurred the following costs. 1. Wood used in the production of furniture. 2. Fuel used in delivery trucks. 3. Straight-line depreciation on factory building. 4. Screws used in the production of furniture. 5 . Sales staff salaries. 6. Sales commissions. 7. Property taxes. 8. Insurance on buildings. 9. Hourly wages of furniture craftsmen. 10. Salaries of factory supervisors. 11. Utilities expense. 12. Telephone bill. Instructions Identify the costs above as variable, fixed, or mixed. Determine fixed costs and unit variable costs using the high-low method and prepare graph