It would have been helpful to mention the item that you are planning to serve to 100 people. But I will assume that it is chopped liver. I would say that about 20 pounds of chopped liver would be right for 100 people. If your guests are particularly gluttonous, you might order more. Don't forget to order rye bread as well; chopped liver goes very well with rye bread. (Or some other kind of bread, if you don't like rye.)
20
1.5 pounds
There should be about 100 pounds of turkey for 100 people. There should be a pound of turkey for each person.
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I would use 10 pounds of rice
You need 25 pounds of green beans
how many pounds of potato salad do I need to feed 100 people
I would make 25 pounds coleslaw.
100 people * 1/2 pounds of cheese per person = 50 pounds of cheese
I would make about 75-80 pounds
The typical serving size is 8oz, so 30 pounds.