Calculating and using a Single Charging Rate The expected costs for the Maintenance Department of Stazler, Inc., for the coming year include: Fixed costs (salaries, tools): $64,900 per year Variable costs (supplies): $1.35 per maintenance hour Estimated usage by: Assembly Department 4,500 Fabricating Department 6,700 Packaging Department 10,800 Total maintenance hours 22,000 Actual usage by: Assembly Department 3,960 Fabricating Department 6,800 Packaging Department 10,000 Total maintenance hours 20,760 Required: Calculating and using a Single Charging Rate The expected costs for the Maintenance Department of Stazler, Inc., for the coming year include: Fixed costs (salaries, tools): $64,900 per year Variable costs (supplies): $1.35 per maintenance hour Estimated usage by: Assembly Department 4,500 Fabricating Department 6,700 Packaging Department 10,800 Total maintenance hours 22,000 Actual usage by: Assembly Department 3,960 Fabricating Department 6,800 Packaging Department 10,000 Total maintenance hours 20,760 Required