Price for 3 meat 250 grad party

[fuzz16f]

I am cooking a grad party for 250 people they want three meats brisket ribs and chicken.How much of each meat should I cook and how much do I charge they are supplying the sides thank for the help

 

[Evil-g]

Try this link.
http://www.smokymtbarbecue.com/bbq-tools/BBQ_Catering_Planner.xls