Well Here goes..
I started with 53 birds, lost 6 in the brooder. I dont have the breakdown in front of me but the total of my expenses (Food, bedding, and chicks was $274.95
$274.90 / 47 birds = $5.85 per bird
I butchered in the following groups
9 weeks - 15 CX birds @ 6 to 6.5 pounds and 1 CX bird (scissor beaked) @ 4.5 pounds
11 weeks - 11 CX birds @ 9.5 to 10.5 pounds and 1 Dixie Rainbow @ 3.5 pounds
13 weeks - 12 Dixie Rainbow birds @ 4 to 5 pounds
This leaves me with 268.5 pounds to 301.5 pounds meat. If I round down to 250 lbs and up to 300 lbs that puts me at $0.92 to $1.10 per pound.
Its a bit of fuzzy math but I would say its accurate to + or - 20%
Your weights of birds were dressed, correct?