Identify each cost below as variable (V), fixed (F). or mixed (M). 1. Steel used in the production of automobiles 2. Fuel used in delivery trucks - 3. Straight-line depreciation on factory building - 4. Navigation systems installed in the production of automobiles - 5. Sales Staff Salaries - 6. Hourly wages of workers who work on the assembly line for a manufacturing company 7. Salaries of factory supervisors - 8. Sales commissions - 9. Telephone bill where the company is charged $100 per month for up to 500 minutes, and 5 cents per minute for the number of minutes above 500 10. Property taxes on manufacturing facility