Help with a math problem! Finding break even points.?

A sporting goods store finds that if it sells x exercise machines per day, then its costs will be
C(x) = 80x + 8000
and its revenue will be
R(x) = −2x2 + 360x
(both in dollars).
(a) Find the store s break-even points.
(b) Find the number of sales that will maximize profit, and find the maximum profit.
2 answers 2