Solution:
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- 120 People can afford to pay $5.00 for a ticket

- Decreasing the ticket price by $0.10 will allow an additional 15 extra people to be to
  afford to buy a ticket.  This means for every reduction of $1.00 from the original ticket
  price, and additional 150 people can afford to buy a ticket.
  
- If the ticket price was decreased by $2.00 to $3.00 per ticket, 420 people would be able
  to afford to buy a ticket (120 + 150 + 150 = 420).
  
- Ticket Price = $5.00, then 120 people can attend.
  Ticket Price = $4.00, then 270 people can attend.
  Ticket Price = $3.00, then 420 people can attend.