23. The Star Youth Soccer Club helps to support its 20 boys and girls teams financially, primarily through the payment of coaches. The club puts on a tournament each fall to help pay its expenses. The cost of putting on the tournament is $8,000 mainly for the development, printing, and mailing of the tournament brochures. The tournament entry fee is $400 per team. For every team that enters, it cost the club about $75 to pay referees for the 3-game minimum each team is guaranteed. If the club needs to clear $60,000 from the tournament, how many teams should it invite? (HINT: formula for the volume for a specific profit = fixed cost + profit amount /price variable cost)