consider an industry with a dominant firm and several fringe firms. assumes that this is a free-entry industry. a dominant firm given by C(q)=800+20q+q^2. The fringe firms all have the same variable cost as the dominant firm, but doubled fixed cost. There are 10 fringe firms. the market demand is Q=4100-5*p. what are the marginal cost of the dominant firm and the fringe firms?