I have been asked to cater brisket/ribs for 100 people on two separate occasions. First one is meat only, second is brisket plus two easy sides. Last time I cooked for 75-100 seems like I cooked 5-6 briskets and had meat left over. How much brisket and brisket/ribs per person uncooked would you recommend? The first time I winged it and happened to come out ok. Also, I am having to travel 3 hours south, pull my BBQ rig and my camper with separate vehicles. How much should I charge for something like this? The first time was just cost, (was for family) so I really don't know how to charge. Assuming cost and double?

I'd figure a third pound of trimmmed, cooked brisket per person. They usually cook down 50% of raw weight, so you'd need 2/3 pound per person. BBQ plates typically go for $8-$12 each depending on the venue and occasion, so that should give you a good idea on what to charge.

What I use:

DIRECT
100 plates at .75lbs brisket per @ $3/lb = $225
100 servings beans (4-6 oz.) = $50
100 servings potato salad (4-6 oz.) = $30
10 loaves of bread = $25
Fresh onions (8-10 sliced) = $15
Pickles (1 gal) = $15
Pickled jalapeos (1/2 gal) = $10
BBQ Sauce = $15
Firewood/Coals = $65

Total = $450

INDIRECT
Add in what you value you place on your time, along with estimated gas expenses, etc.

Divide by 85 paid plates for buffer on attendance unless it's flat fee charge to get $5.30 plus the indirect costs. At least that's where my math usually leaves me - in that $5 material range somewhere. I usually end up charging about $10-12 based on distance.

Figure 50% loss on brisket, 10% on ribs.
At $3/lb on brisket your finished beef will cost you $6/lb. A 6oz serving costs $2.25 for beef alone.
Get a portion cost on everything you will serve, and total it. Then get your supply/travel cost, and whatever you want to earn. Add together, divvy by the total headcount you are serving, and that's your selling price. I haven't done brisket, but I do pork tenderloin/sausage, boiled shrimp/sausage, chicken....all for $12/person served minus beverage. Spaghetti with home made sauce is $9. Beef/vegetable soup runs $7. I cook for 30-50 when our group goes riding in Arkansas. Since I'm already going I don't factor in travel. You may be better off charging a fee to travel, and then a plate cost. Maybe $250 travel and $12/plate.