can someone help me solve this question? would be greatly appreciated!

The manager of Speedy Car Inspection reviewed the monthly operating costs for the past year. The costs ranged from $4,200 for 1,200 inspections to $3,800 for 800 inspections. Read the requirements. Requirement 1. Use the high-low method to calculate the variable cost per inspection. Select the formula and enter the amounts to calculate the variable cost per inspection. (Round to the nearest cent.) =Variablecostperinspection= Requirements 1. Use the high-low method to calculate the variable cost per inspection. 2. Calculate the total fixed costs. 3. Write the equation and calculate the operating costs for 900 inspections. 4. Draw a graph illustrating your total cost under this plan. Show the costs at 800,900 , and 1,200 inspections. (Use the high-low method for all calculations.)