he expected costs for the maintenance department of stazler, inc., for the coming year include: fixed costs (salaries, tools): $61,845 per year variable costs (supplies): $1.45 per maintenance hour estimated usage by: assembly department 4,800 fabricating department 6,100 packaging department 10,800 total maintenance hours 21,700 actual usage by: assembly department 3,875 fabricating department 6,200 packaging department 10,000 total maintenance hours 20,075