Firm A and firm B both have total revenues of $100,000 and total fixed costs of 50,000; firm A has total variable costs of $80,000, while firm B has total variable costs of $110,000. a. How much profit or loss is each firm earning? Should firm A operate or shut 5, down? What nbout firm B? Why? b. Flrms C and D both have total revenues of $200,000 and total costs of $250,000 firm C has total fixed costs of $40,000, while firm D has total fixed costs of $70,000. How much profit or loss is each firm earning? Should firm C operate or shut down? What about firm D? Why