The revenue from the sale of x mineral-based makeup sets is given by R(x) = 42x -0.3x2 dollars. The total cost is given by C(x) = 0.1x2 - 10x + 1290 dollars, where 0 < x < 100. Determine the interval of sales for which the profit is increasing and the interval for which it is decreasing. Express your answer in open intervals. Answer 2 Points Keypad Selecting a radio button will replace the entered answer value(s) with the radio button value. If the radio button is not selected, the entered answer is used. Increasing on: Decreasing on: Never Increasing Never Decreasing