A market for a private good contains two externalities. The demand function is MPB = 120 - 0.03Q The supply function is MPC = 24 + 0.02Q There is a negative consumption externality, MEC = 19 + 0.01Q, and a positive production externality, MEB = 11 + 0.01Q. Calculate the total social benefit at the socially efficient quantity, Q* ..