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). $ Need Help? Read It 6. DETAILS BERRAPCALC7 1.3.087. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A newsletter has a maximum audience of 80 subscribers. The publisher estimates that she will lose 1 reader for each dollar she charges. Therefore, if she charges x dollars, her readership will be (80 - X). (a) Multiply this readership by x (the price) to find her total revenue. Multiply out the resulting quadratic function. f ( x ) = (b) What price should she charge to maximize her revenue? (Hint: Find the value of x that maximizes this quadratic function.) $