8:

A manufacturer sells video games with the following cost and revenue functions (in dollars), where x is the number of games sold. Determine the interval(s) on which the profit function is increasing. C(x) = 0.15x2 - 0.00008x3 R(x) = 0.726x2 - 0.0002x3 . . . . . Select the correct choice below and fill in any answer boxes within your choice. O A. The profit function is increasing on the interval(s) (Type your answer in interval notation. Simplify your answer. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) O B. The profit function is never increasing