Consider the following cost information for a firm that operates

in a perfectly competitive market. Current price is $10.

Q (quantity of output)	Total cost ($)
0	60
2	70
4	90
6	120
8	160
12	210

(1) Using the condition for optimal quantity of output for a competitive firm, find the optimal quantity of output.

Q (quantity of output)	Total cost ($)	MC
0	60
2	70
4	90
6	120
8	160
12	210

(2) Evaluate the profitability of the optimal quantity of output derived in (1)

(3) How many units of output should the firm produce in the short run?