Please answer correct calculation explain asap plz

Don't answer by pen paper plz

The monopolist is currently producing Q= 2000, Price charged = $500, MR of the last unit produced is $300, Marginal Cost of the last unit is $250 and the ATC = $400. i. Draw the diagram for the monopoly depicting the situation above. ii. Calculate the current level of profit per unit and total profits iii. What should the monopolist do to maximize profits? Explain.