Below is an example, wondering what you missed was the 1/30 and 1/20 manufacturer usage in each region.
For Americas, it is:
12000*0.3*0.6*50000/30 = 3.6m
Most commonly omited factor is the below one, that case you may got 108m instead (using Americas as an example)
![](/uploads/qa/answers/85358/1736457118-p90492z20j41.png)
Feel free to reach out if any follow up Qs, cheers!
Han