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Pfizer own the copyright for "Pfizer COVID Vaccine (PCV)". The total cost of producing Qunits of PCV is TC=100+50Q+0.5Q2. The annual demand for PCV is P=300-0.2Q. Q is the number of units of PCV. The annual interest rate facing all agents in the economy is 8.75%. a. How many units of PCV should Pfizer produce? What price should Pfizer charge for one unit of PCV? Clearly explain your reasoning, b. What is TR from PCV to Pfizer? What are Pfizer's annual profits from PCV? c. Suppose the Pfizer copyright of PCV was due to expire by 2021. Describe the new market structure that would occur if PCV entered the public domain, meaning anybody could use PCV. What would be the new price of one unit of PCV? How many units of PCV would be sold by the COVID vaccine industry