4. Arena Ticket Sales (7 marks, TH) A small sports arena hosts basketball games for a semi~professiona| basketball league. The arena charges $80 for courtside tickets, $50 for lower bowl tickets, and $25 for upper bowl tickets. (a) Write an expression describing the total amount of mone').r earned on a particular night of a game. {2 marks} Let represent Let represent Let represent Expression: (b) Use your expression to determine how much the arena will earn if it sells 100 courtside tickets. 200 lower bowl tickets and 150 upper bowl tickets. (Include a closing sentence) (2 marks}