Dont worry, so if you have 10 players coming skate, that means you have to
1. 4.5*10 so that is the cost of snacks for the 10 skaters
2. 1.5*10 so that is the cost of skates for the 10 skaters
3. Finally the flat rate of 250 will stay the same no matter the number of skaters
Sooooo
($45+$15+$250=total pricing for 10 players!)
Sorry i dont know the booster/coaches problem