City and Country Cycles finds that if it sells x racing bicycles per month, its costs will be C(x) = 620x + 54,000 and its revenue will be R(x) = -3x2 + 1,700x (both in dollars). (a) Find the store's break-even points. (Enter your answers as a comma-separated list.) bicycles per month (b) Find the number of bicycles that will maximize profit. (Enter your answer in bicycles per month.) bicycles per month Find the maximum profit (in dollars). $