28-38 Indicate whether the following are typically: variable costs (B) fixed costs (C) mixed costs or (D) none of these. Hourly Wages Factory Employees. Direct Materials. Rent. Depreciation (Straight Line). 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. |Depletion of a copper mine. | Sales Commissions Office Salaries. Accounts Receivable. Cell plan $50 per month+ 1 cent per Insurance. Deferred Revenue