A boat tour company charges $11 for a harbour tour and averages 450 passengers on Saturdays. Over the past few months, the company has been experimenting with the price of a tour and has notice that every increase of $1 in the price decreases the number of customers by 25.
The algebraic model is R=(11+x)(450-25x)
Use the model to determine the price that maximizes revenue
Use the model to determine the maximum revenue.