The Market Demand for a Monopoly Firm Is Estimated to Be

The market demand for a monopoly firm is estimated to be: where is quantity demanded,P is price,M is income,and is the price of a related good.The manager has forecasted the values of M and will be $50,000 and $20,respectively,in 2016.For 2016,the marginal revenue function is

A) MR = 290 - 0.5P.
B) MR = 580 - 0.001Q.
C) MR = 290- 0.002Q.
D) MR = 600 - 0.004Q.
E) none of the above