For many years, Comstock Company has produced an electrical part that it uses in the production of diesel tractors. The company's unit product cost for the part, based on a production level of 60,000 parts per year, is as follows:

Per Part Total Direct materials $ 4.00 Direct labour 2.75 Variable manufacturing overhead - 0.50 Fixed manufacturing overhead, 3.00 $180,000 traceable Fixed manufacturing overhead, common (allocated on the basis of labour hours) 2.25 $135,000 Unit product cost $12.50