Demand for an electric fan is related to its selling price p (in dollars) by the equation n = 1800 – 60p where n is the number of fans that can be sold per month at a price p. Find the selling price that will maximize the revenue. The selling price that will yield the maximum revenue is $ *. TIP Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity

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