Crane Corporation manufactures a single product. Monthly production costs incurred in the manufacturing process are shown below for the production of 3,100 units. The utilities and maintenance costs are mixed costs. The fixed portions of these costs are $321 and $214, respectively. Production in Units 3,100 Production Costs Direct materials $8,017 Direct labor 15,693 Utilities 1,716 Property taxes 1.069 Indirect labor 4,810 Supervisory salaries 2,031 Maintenance 1.299 Depreciation 2.566 Identify the above costs as variable, fixed, or mixed. Costs Direct materials Direct labor