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The revenue from the sale of x blankets with arms is given by R(x)=28x−0.2x^2 dollars. The...

The revenue from the sale of x blankets with arms is given by R(x)=28x−0.2x^2 dollars. The total cost is given by C(x)=0.1x^2−17x+1690 dollars, where 0≤x≤120. 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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