Demand for football tickets for the local high school team decreases by 40 for every $1 increase in ticket price. At a price of $15, the number of...

Demand for football tickets for the local high school team decreases by 40 for every $1 increase in ticket price. At a price of $15, the number of tickets sold is 1000. If the goal is to maximize revenue, what price should be set for tickets?

A.$10

B.$15

C.$20

D.$25

E.$30