Let's say your local lumberyard charges $5.00/bf for 4/4 rough maple, and an additional $0.50/bf for milled pieces.
You pick out a milled board with actual dimensions 3/4"x6"x96".
What is the charge?
Is it 1x6x96/144*$5.50 = $22 since the board started as 4/4 rough?
Or do you use the actual milled measurement and pay 0.75x6x96/144*$5.50 = $16.50?