A concert promoter sets the ticket price at p dollars. The number of tickets that can be sold at that price is modeled by n=800−10p, where 0≤p≤80. The revenue, in dollars, from ticket sales is given by the function
R(p)=p(800−10p),R(p)>0.
Which of the following is the best interpretation of the factor 800−10p in this context?