Two firms (A and B) play a simultaneous-move quantity competition game (i.e. Cournot com- petition) in which they can choose any Qj [0, ). The firms have cost functions C (Qj) =10Qj + 0.5Q2j , and they face an inverse market demand curve of P = 220 (QA + QB ). 1. What is firm A's best response to an arbitrary QB selected by firm B? 2. What are the equilibrium QA and QB selected in this game? What is the equilibrium price? 3. What is total surplus (consumer surplus plus profits)?