When we did our first catering job a while back, we figured the highest cost per item would be the meat. We have a local slaughter house, so I can get my whole pigs for 1.01 pp and my ribs for 1.39 pp. The rib slabs cost me about 5.00. You can get about 4 servings per slab (about 3 bones each if you are serving pork too. For 100 people, I would figure meat - 75.00 for pork, 25 slabs of ribs. Cost of meat 200.00. The sides are hardly anythig, and with the plates, etc.. you could figure on spending about 275-300 bucks. Now, call around to a couple places as if you were having a party, and see what they charge. Be sure you are comparing apples to apples and oranges to oranges. This particular party mentioned in my example...I would probably charge at least 8.00 per person, yielding a net profit of 500.00
Alan