Assume that scientific studies provide you with the following information concerning the benefits and costs of sulfur dioxideemissions:

Benefits of abating(reducing) emissions:

MB=40020A

Costs of abatingemissions:

MC=200+5A

where A is the quantity abated in millions of tons and the benefits and costs are given in dollars per ton.

What is the socially efficient level of emissionsabatement? (Enter your response rounded to two decimal places.)

The socially efficient level of emissions abatement is ? tons.