Sarah and her 4 friends decided to put together a fundraiser for her school dance. They needed to raise $2,500 in order to put on the dance. They decided to sell cookies to raise money. Each cookie costs $4.50. If each of the 5 students sell 15 cookies every day, how much money are they making? At this rate, how many cookies would they have to sell in order to get to their goal? How long would it take them to raise all the money needed?