A chemical pesticide producer releases wastes into the Ohio River. Because the negative effects are not captured by the private market, there is a market failure, which is illustrated by the following functions, where Q is the amount of liquid chemical pesticides in thousands of barrels, and P is the price per barrel:            

MSB = 70 ‒ 0.1Q

MPC = 10 + 0.4Q

MEC = 0.1Q

a. Find the competitive equilibrium and the level of Mπ at that point. 

b. Find the efficient equilibrium and the Mπ function at that point.