The demand for carp in Ing'fell is given W100 = 600 10F. Every firm in this industry is identical and the optimal rm size is 20 units. All carp producers have a long run average total cost that minimizes at $50 per unit, what will the total number of firms be in the long run? a. 0 firms h 5 firms c. 10 firms d. 20 firms e None of the above. a explain why answer is b