The price p (in dollars) and the quantity q sold of a certain product obey the demand Equation : q = 800 - 20p and 0 ≤ p ≤ 40 (i) Express the revenue R as a function of q. (ii) What is the revenue if 20 units are sold? (iii) What quantity q maximizes revenue? What is the maximum revenue? (iv) What price should the company charge to maximize revenue? (v) What price should the company charge to earn at least $3500 in revenue?

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