The accompanying table shows a pizzeria's fixed cost and variable cost at different levels of output. Pizzas sell for $20 each. Number of Pizzas Fixed Cost ($/Day) Variable Cost ($/Day) 0 500 0 25 500 150 50 500 250 75 500 450 100 500 850 125 500 1,650 Between 25 and 50 pizzas, the pizzeria's marginal cost is 4 6 8 16