The revenue from the sale of (x) door frame chin-up bars is given by (R(x) = 30x - 0.2x^2) dollars. The total cost is given by (C(x) = 0.2x^2 - 18x + 700) dollars, where (0 le x le 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.
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2x^2) - (0.2x^2 + 18x + 700) P(x) = 30x - 0.2x^2 - 0.2x^2 - 18x - 700 P(x) = -0.4x^2 + 12x - 700 Show more…
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