The table below shows total costs for a purely competitive firm which sells its output at RM90 each

Output	TC	MC	AC	AVC
0	50			-
1	150			100
2	210			80
3	280			76.67
4	370			80
5	500			90
6	680			105

1. Complete the above table
2. What is the equilibrium level of output?
3. Calculate the amount of profit or loss at equilibrium.
4. Using marginal approach, sketch a diagram to illustrate the equilibrium of the firm.