I Don't Do Math.

I figured out where my math went wrong (at the very beginning).

I thought I needed the following:
6.66 board feet of 4/4 Poplar
10 board feet of 5/4 Quartersawn White Oak
20 board feet of 4/4 Quartersawn White Oak

After doing the math again, here is what I actually needed:
5bf 4/4 Poplar
20bf 5/4 QSWO (twice as much!)
24bf 4/4 QSWO (20% more)

Here is what I ordered (adding 50% to each):
10bf 4