A hypothetical competitive model for scrubbers is given as follows: MSC = 70.0 + 0.5Q MPB = 350.0 - 0.9Q MEB = 56.0 - 0.2Q Where MSC is marginal social cost, MPB is marginal private benefit, and MEB is marginal external benefit. Answer the following question based on this information. Based on the above information, the competitive market equilibrium quantity is: Group of answer choices 210 200 170 175 161