A theater sells t tickets at a price of p dollars each. The theater conducts a survey and predicts that if the price of each ticket is changed by $2, the number of tickets sold will change by 15 tickets. If n is the number of times the theater changes the ticket price by $2, the expression (p +2n) (t-15n) can represent the theater's total revenue, in dollars. In this expression, what does (t-15n) represent? the number of tickets the theater will sell if the ticket price is increased by $2 the number of tickets the theater will sell if the ticket price is increased by $2n the number of tickets the theater will sell if the ticket price is decreased by $15 the number of tickets the theater will sell if the ticket price is decreased by $15n ​