2. (50 pts) The management of Buff Sports Stadium believes that the number of sporting events each month is an measure of activity for total clean-up cost. Shown below are event figures and total clean up costs for the past four months: July August September ...... October Number of Sporting Events 28 34 16 22 Total Clean-up Cost $30,900 $34,200 $20,700 $28,200 Required: a. Estimate the variable cost per sporting event and the fixed cost using the high-low method. Show your work! b. Develop a cost formula for Total clean-up costs. c. Use the cost formula developed in b to estimate Total clean-up costs if there were 18 sporting events