Simple math.
Take 9. Divide it by the square root of "7.8", which is 2.79284800875. Now, take that and multiply it by the address of Microsoft- One Microsoft Way, Area code 98052, so 1+8+8+5+2=24, which is 67.02835221. Now, subtract the model number of the best selling Lumia- L520-which puts us at -452.97164779.
See all that confusion? Who wants that???
Windows 10. The Math is simple.
If you argue with math, you will lose.