Three ( Marka) The management of Buff Sports Stadium believes that the number of sporting events each month is a mesure 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 Required Number of Toral Sporting Clean-up Events Cost 28 $30,900 34 16 22 $34,200 $20,700 $28,200 Estimate Buff's cost formula for monthly clean up cost using the high-low method