Round Baler Sales Using RFV

Hey all, who sells their round bales by relative feed valve? What is your bale weights and how would you adjust the price accordingly?
Example
You weight some bales to sell and you average 1500 lbs. Tests come back at 197 RFV. You sell 500 bales of the same hay, but your avg jumps to 1600lbs. How would you adjust price for the extra 100 lbs? It's probably not rocket science, but I just can't wrap my noodle around it to figure it out! Lol
Thanks for any help.

Round Baler Sales Using RFV