Consider the following cost information for a pizzeria:

Quantity: 0 dozens pizzas, 1,2,3,4,5,6

Total cost: $300,$350,$390,$420,$450,$490,$540

Variable cost: $0,$50,$90,$120,$150,$190,$240

a. What is the pizzeria’s fixed cost?

b. Construct a table in which you calculate the marginal cost per dozen pizzas using the information on total cost. Also, calculate the marginal cost per dozen pizzas using the information on variable cost. What is the relationship between these sets of numbers?