A market is supplied competitively by 50 low- cost firms, each with cost curve C(q) = 350 + 2q+ q^2, and n high-cost firms, each with cost curve C(q) = 400 + 2q +q^2. Market demand is Q = 2500 - 10*p. If none of the high-cost firms make a positive profit, how large is n? how much profit do the low cost firms make?