I'MaPizzaCo. produces and sells specialty pizzas. Last year, it produced 8,000 mushroom, sausage and spinach pizzas and sold each one for $8. To produce these 8,000 specialty pizzas, the company incurred variable costs of $42,000 and a total cost of $66,000. I'MaPizzaCo's average fixed cost to produce 8,000 specialty pizzas was