Gold production is almost certainly how Forbes described it.
Mraulaxon has a gold value of "230", ran 100% production all week and has a 13% tax rate. 230 x 7 x 0.13 = 209.3. I received 208 gold. Seems to work.
Not sure where the "that's the gold you get at 10% tax rate" came from, because I've heard it before, but I do not think it's correct.
