Determine fixed, variable, and mixed costs. E56 PCB Corporation manufactures a single product. Monthly production costs incurred in the manufacturing process are shown below for the production of 3,000 units. The util ities and maintenance costs are mixed costs. The fixed portions of these costs are $300 and $200, respectively. (LO 1), AP Production in Units Production Costs Direct materials Direct labor Utilities Property taxes Indirect labor Supervisory salaries Maintenance Depreciation 3,000 7,500 18,000 2,100 1,000 4,500 1,900 1,100 2,400 Instructions (a) Identify the above costs as variable, fixed, or mixed