What math and what system ? It is simpler and easier the way Apple does it now. Money originates in each country that a sale is made some of which flows into t

What math and what system ? It is simpler and easier the way Apple does it now. Money originates in each country that a sale is made some of which flows into the regions e.g. Americas or APAC. It would be much harder to be constantly moving money in and out of the US.