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