Listed here are product costs for the production of soccer balls. Identify each cost (a) as either fixed or variable and (b) as either direct or indirect by selecting the appropriate dropdowns. Variable or Fixed Direct or indirect Product Cost 1. Thread to hold leather together 2. Coolants for machinery 3. Benefits for assembly workers 4. Annual flat fee paid for factory security 5. Machinery depreciation (straight-line) 6. Rubber core for soccer balls 7. Insurance on factory