2. The long-run cost function for each firm that supplies \( Q \) is \( C = q^3 - 2q^2 + 6q \). Firms will enter the industry if profits are positive and leave the industry if profits are negative. Describe the industry's long-run supply function. Assuming that the corresponding demand function is \( D = 1500 - 200p \). Determine the equilibrium price, aggregate quantity, and number of firms. (30%)