Suppose economists estimate the following cost and benefit functions associated with the 1990 CAAA: 

TSB= 75A – 0.4A²                

MSB = 75 – 0.8A

TSC= 25A +0.85A²              

MSC = 25 + 1.7A,     

where A represents the percent of pollution abatement, and costs and benefits are measured in millions of dollars.

a. Find the TSB and TSC associated with an abatement standard of 30. Based solely on the relative values of TSB and TSC, can you state definitively whether this abatement level is efficient? Explain.

b. Find the efficient level of pollution abatement (A_E).