It all depends on how thick the cake is. Try using a 10 inch or 12 inch pans that are 3 inches deep.
Or you can do 8 inch, 10 inch, and 12 inch that are 2 inches deep and double layer each one and that would be enough. Where I live its hard to find 3 inch deep cake pans.
See the Cakefairy link below for a listing of cake sizes per servings.
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It will depend on how large the cake is. The base tier could be 20 inches or 16 inches or 12 inches.
Depends how big or small you cut it ;) You could serve a hundred people with just a few crumbles per person.