All kinds of tickets have a serial number, a price, and can be printed (which
 shows the ticket number, price, and type).  The price is derived from the
 type of the ticket and potentially other properties of the ticket.
Walk-up tickets are purchased the day of the event and cost $50.
Advance tickets purchased 10 or more days before the event cost $30,
 purchased less than 10 days before cost $40.
Student advance tickets are half the price of regular advance tickets (no
 student prices for walk-up tickets).  When student tickets are printed,
 the message "ID required" is also displayed.