How much should the food truck charge per hotdog to maximize daily revenue? What is the maximum daily revenue?

A food truck sells 60 hot dogs each day when it charges $4.00 per hot dog. For a $0.25 decrease in price, the food truck sells 5 more hot dogs.

04/08/16

The mp3 player was on sale for $20 less than the original price

Math algebra problem   

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