Why do some people write the dollar sign after the number? Similarly, why do some people write the percent sign before the number? I initially thought it might be a locale thing (like swapping commas and decimal points), but I've seen a lot of Americans doing it too.
> Why do some people write the dollar sign after the number?
For foreigners, that's easy, that's how you write currencies in other languages.
For American doing it, I guess it is just a typing artefact. You think "ten dollars", you write "10$", there is no autocorrect for that kind of things so you let is slide.