Different Food Styling How Much Food Do I Order For A Party Of 90 People If I Have 3 Different Buffet Style Menus?

How much food do I order for a party of 90 people if I have 3 different buffet style menus? - different food styling

I want a good selection, but we are not of food. We can use the menus in 3 different categories:
= Of course, everyone can enjoy
= Ca. Enjoy 75% of the average can
can benefit exotic = 40-50%

Thank you!