Montana Company reports the following total costs at two levels of production. Classify each cost as variable, fixed, or mixed. 5,000 Units 10,000 Units Indirect labour $3,000 $ 6,000 Property taxes 7,000 7,000 Direct labour 27,000 54,000 Direct materials 22,000 44,000 Depreciation 4,000 4,000 Utilities 3,000 5,000 Maintenance 9,000 11,000