Rates vary, but most are based off what fats are selling for.
If you sold the animal on the rail it would bring about $1.33 carcass weight in an 80 cent live market.
Selling an entire animal is not much hassle, but can get expensive for the customer. A 700 pound carcass at the $1.33 and 40-60 cents for processing is between $1200 and $1350 roughly. The expense isn't so much the per pound, but the total cost. Many people are on the payment plan and can't front a grand for a beef.
I get a premium for my beef, I charge about 25 cents more than the rail price for the source verified aspect and no implants or medications. I cover all the killing and processing costs and they are added to the final price. Right now I am at $2.35/lb (Canadian based on a rail of $1.46 Canadian) carcass weight no added costs to the buyer.
Make sure your customer knows they get back less weight than they pay for. Many don't know cutting losses and such.