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 1. Product Cost Rubber core for soccer balls 2. Thread to hold leather together 3. Taxes on factory 4. Wages of assembly workers 5. Machinery depreciation (straight-line) 6. Annual flat fee paid for office security 7. Leather covers for soccer balls