Calculating and Using Dual Charging Rates The expected costs for the Maintenance Department of Stazier, Inc., for the coming year include: Fixed costs (salaries, tools): $74,800 per year Variable costs (supplies): $1.4 per maintenance hour The Assembly and Packaging departments expect to use maintenance hours relatively evenly throughout the year. The Fabricating Department typically uses more maintenance hours in the month of November. Estimated usage in hours for the year and for the peak month is as follows: Yearly hours Monthly Peak Hours Assembly Department 4,300 345 Fabricating Department 7,000 1,265 Packaging Department 10,700 690 Total maintenance hours 22,000 2,300 Actual usage for the year by: Assembly Department 3,250 Fabricating Department 7,100 Packaging Department 9,900 Total maintenance hours 20,250 Required: Check My W