if it's buffet have staff serving proteins
If it's plated have a food count walking in if they want reduced costs, that way you know who's having what.
just cus.....break down your fee to rentals, staff, food.
Food alone apps $21+
dinner buffet $55-65
100 guests 7 staff @ $25 per hour per staff, at least 2 hours prior and 1 hour cleanup
Rentals....whatever they need + xx% over the rental fee