A group was selling tickets for their fundraising event. For the first day of the event, they sold 30 pre-sale tickets and 45 tickets at the door. For the second day, they sold 40 pre-sale tickets and 20 at the door. They made $180 more on the tickets for the first day than they did for the second day. All tickets were the same price. How much did they charge for each ticket? Write and solve an equation.