Exercise 18-5 Classifying costs C2 Selected costs related to Apple's iPhone are listed below. Classify each cost as either direct materials, direct labor, factory overhead, selling expenses, or general and administrative expenses. 1. Display screen 5. Glue to hold iPhone cases together 2. Assembly-line supervisor salary 6. Uniforms provided for each factory worker 3. Wages for assembly workers 7. Wages for retail store salesperson 4. Salary of chief executive officer 8. Depreciation (straight-line) on robotic equipment used in assembly