[BrandoElFollito]

Brag about what? Please take a moment to read my comment with understanding.

And the dollar sign goes on the side I put it: nine hundred thousand dollars. The fact that you want to write $900k is just an idea specific to the finance world (such as using parentheses for negative numbers).

Do you usually write m4, in7 or lb9?

[rafram]

Dollar sign goes before the number, cent sign goes after, other units go after: $7, 7¢, 7 lbs. You can’t pretend convention doesn’t exist just because it’s weird! That’s why it’s convention and not common sense.