Mozena Corporation manufactures a single product. Monthly production costs incurred in the manufacturing process are shown below for the production of 3,700 units. The utilities and maintenance costs are mixed costs. The fixed portions of these costs are $420 and $330, respectively. Production in Units 3,700 Production Costs Direct materials $7,881 Direct labour 15,133 Utilities 1,863 Property taxes 1,120 Indirect labour 4,958 Supervisory salaries 2,100 Maintenance 1,514 Depreciation 2,700