Yes, I keep putting that too, and it gets marked wrong. Please report that your answer should also be accepted as correct. I just reported it again. Dec. 22, 2020. I know Koreans don't always use the commas, but usually in English we do.
Dollar is one of the only currency i know of that puts the currency name before the number. I don't remember for pounds but i know for sure euros is written after (0€) and yen and won yuan as well (0¥) and my keyboard does not have the other simbols lol