An appliance store sells three brands of TV sets, brands A, B, and C. The profit per set is $30 for brand A, $50 for brand B, and $60 for brand C. The total warehouse space allotted to all brands is sufficient for 600 sets, and the inventory is delivered only once per month. At least 100 customers per month will demand brand A, at least 50 will demand brand B, and at least 200 will demand either brand B or brand C. How can the appliance store satisfy all of these constraints and earn maximum profit?