A deli sells 720 sandwiches per day at a price of $6 each. ... A market survey shows that for every $0.10 reduction in the price, 20 more sandwiches will be sold. How much should the deli charge in order to maximize revenue? The deli should charge $ for a sandwich to maximize revenue. (Round to the nearest cent as needed.)

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A: You have done a mistake which I have shown in step 3 of this solution. Kindly go through it.

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A: We find the point where limit does not exist

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