The figure below presents the demand curve, marginal revenue, and marginal cost facing a monopolist producer. 

a.     What is the profit maximizing level of output? 

b.     what price will the monopolist charge for the quantity in part A? 

c.     What is the value of the dead weight loss under monopoly? 

d.     What is consumer surplus under monopoly? 

Determine the loss of consumer surplus under monopoly outcomes versus efficient outcomes. 

Please add the references if you use any.