The industry for air fresheners has one dominant firm, Glyde, and a number of smaller firms. The total market demand for air fresheners is Q = 80 - 2P.
The small firms' supply curve is QL = P - 10 where QL is the total quantity supplied by all the smaller firms. Glyde's costs are given by TCG = 100 + 6 QG. What price should Glyde set to maximize its profits?