Suppose that wood industry is a perfectly competitive industry that involves 120 identical firms. The production function of each of these identical firms is as follows : q=K*L^(1/2) where K denotes capital and L denotes labor with the corresponding prices: P_K= 10 and P_L=16. Suppose that capital is fixed K=4 and market demand function is given as follows: Q^D = 1000 - 40P. What is the economic profit at the equilibrium, respectively