Study the diagram below carefully and use the given information toanswer the questions that follow.

Determne: (i) The profit maximizing output;
(ii) the firm's profit if it produces 600 units of output;
(iii) the total cost if the firm produces 400 units.
Calculate the:
total revenue;
profit of the firm at the output level of 900 units.
(c) What will happen if a firm's market price falls below its average variable cost?