Sunrise Juice Company sells its output in a perfectly competitive market. The firm's total cost

function is given in the following schedule:
Output Total Cost
(Units) (RM)
0 50
10 120
20 170
30 210
40 260
50 330
60 430
Total costs include a "normal" return on the time (labor services) and capital that the owner
has invested in the firm. The prevailing market price is RM7 per unit.

a. Prepare (i) marginal cost and (ii) average total cost schedules for the firm.

b. Illustrate what is the firm's profit maximizing output level?

c. Is the industry in long-run equilibrium? Justify your answer.