A manufacturer sells video games with the following cost and revenue functions (in dollars) where x is the number of games sold, for 0 less than or equal to x less than or equal to 3300.
C(x)= 0.32 x2 - 0.00004x3
R(x)= 0.848 x2 - 0.0002x3
Determine the intervals on which the profit function is increasing.