Your guestimate costs will be about $4.50 per plate. If I was doing this, I'd ask at least $15 per plate. Are you providing plates, cups, napkins, untensils? If using plastic and paper I'd add about $1 per plate.
Watch out that they don't rope you into doing the table decorations. Add at least $25 per table for that. I got burned real bad on a wedding gig on time.
Southern Brethren BBQ Competition Team
"It's all about getting paid!" - Myron Mixon
"I love being hated in my hometown!" - David Hair
KingFisher Gator Rotisserie cooker, WSM, Stainless 5 burner with IR gas grill, Turkey Fryer, Weber JD Commemorative grill, slightly used Bandera chamber for future use as a cold smoker, Masterbuilt 40" insulated ELECTRIC smoker