I need step by step solution to the following this question asap .I have limited time so please do it quickly with detailed explanation

thanks in advance/Ha

Q-Two firms produce a good which leads to pollution.

Assume that the marginal cost for cleaning up in one firm is given by 1 = 40 4 and for the other firm it is given

by 2 = 40 (4/3) where q is pollution. The marginal damage curve for the society is given by p=q. Derive and show in a figure the optimal level of pollution for the society, the optimal tax level and how much the firms clean up given this tax. Assume now that the government instead uses regulation so that the firms have to clean up an equal amount. Show in the figure why regulation is not cost efficient and derive the societys costs of regulation compared to taxation.