pleases help solve

Suppose that the market demand curve in a toys industry is given by Qd = 110 10p. The industry is dominated by a large firm with a constant marginal cost of $5 per unit. There also exists a competitive fringe of 200 firms, each of whom has a marginal cost given by MC = 5 + 100q, where q is the output of a typical fringe firm. A. What is the equation of the supply curve for the competitive fringe? What is the equation of the dominant firm's residual demand curve? (1 point) B. What is the profit-maximizing quantity of the dominant firm? What is the resulting market price? (2 points) C. At this price, how much does the competitive fringe produce, and what is the fringe's market share? What is the dominant firm's market share? (2 points)