Sophie bakes and sells bread. On a typical day, she sells 125 loafs of bread for a price of $5.00 per loaf. Over the last few months, Sophie has been experimenting with her pricing and finds that for every increase of $0.25 in the price per loaf, she loses 5 customers.

A. Write an equation that models Sophie’s revenue.
b. Determine the maximum revenue that Sophie can expect.
c. Determine the price per loaf that results in a maximum revenue.