Answer:
a) Fixed or variable and (b) as either direct or indirect.
Explanation:
1. Lace to hold leather together: indirect cost/ variable
2. Wages of assembly workers : direct cost/ variable
3. Coolants for machinery : indirect cost/ fixed
4. Annual flat fee paid for factory security : indirect cost/ fixed
5. Leather covers for soccer balls: direct cost/ variable
6. Machinery depreciation (straight-line): indirect cost/ fixed
7. Taxes on factory: indirect cost/ fixed