Please help and show steps of how you got there!!!

Johnston Company's facility maintenance costs represent a mixed cost. The company's controller used the highlow method to estimate the following Total Cost equation for each month's maintenance costs: TotalMaintenanceCost=$12,000+$2.40perunit The controller is working on preparing the company's maintenance cost budget for next year and has asked for your help analyzing this data. Using the total cost equation, determine an estimate of total maintenance cost for a month in which production is expected to be 45,000 units