Answer:
Variable costs change with the volume of production.
Fixed costs remain constant for a certain level of production.
Mixed costs have an element of both in that they are constant but will change if a certain level of production is passed.
1. Wood used in production of furniture ⇒ Variable cost
2. Fuel used in delivery trucks ⇒ Variable cost
3. Straight-line depreciation on factory building ⇒ Fixed cost
4.Screws used in production of furniture ⇒ Variable cost
5. Sales staff salaries ⇒ Fixed cost
6. Sales commissions ⇒ Variable cost
7. Property taxes ⇒ Fixed cost
8. Insurance on buildings ⇒ Fixed cost
9. Hourly wages of furniture craftsmen ⇒ Variable cost