Number 21. Can you please explain how you got the answer. Thanks!

A firm has a division which produces chemical Y, whose average total costs are ATC = 50 + 2Q (where Q is the quantity of Y), and a marketing division which adds own average total costs of ATC = 20 + 3Q. There is no external market price of Y. The transfer price of Y should be Analyze the effect of government intervention in business: The antitrust law that made "every contract, combination restraint of trade' illegal was the Sherman Act. Clayton Act. Federal Trade Commission Act. Robinson-Patman Act. Celler-Kefauver Act. If there are two large firms, each with one-quarter of the market, and ten firms each with one-twentieth of the market, in an industry, the market concentration 'ratio will be