Exercise 18-6 (Part Level Submission) PCB Corporation manufactures a single product. Monthly production costs incurred in the manufacturing process are shown below for the production of 4,236 units. The utilities and maintenance costs are mixed costs. The fixed portions of these costs are $424 and $282, respectively. 4,236 Production in Units Production Costs Direct materials Direct labor $10,590 25,416 2,965 1,412 6,354 2,683 1,553 3,389 Utilities Property taxes Indirect labor Supervisory salaries Maintenance Depreciation