I'm starting a revolution here.
You say "Forty dollars" 40$
Not "Dollars 40" $40.
I instinctively write 40$ because that is the order my brain goes in. It literally takes me an extra 5 to 10 seconds to stop and think before I type it to go $40. I should just flip my brain and read all currency back as "a dollar 40"
I wouldn't mind moving to Europe though.