An inspection service received their monthly operating costs for the past year. Costs ranged from $4,000. for 1,000 inspected units to $36,000. for 600 inspections. 1. Calculate the variable cost per inspection. 2. Calculate the total fixed costs. 3. Write the equation and calculate operating costs for 800 inspections. ($3,800) 4. Draw a graph illustrating the total costs under this plan. Label the axes and show the costs at 600, 800, and 1,000 inspections.