When dealing with numbers and symbols, it is important to both capture what the speaker says and format it in a way that reflects their intent. If they are discussing money, format it as you would for money. If they are discussing a time, format it as you would for time.
However, be consistent with using either the words or the symbols. Also, do not include both the symbol and the word for the symbol.
Whenever there is doubt about the speaker's intent, it is best to include simply the numbers or words spoken.
So how much was the burger, and what time did you get back home?
It was about six fifty.
What was? The burger or the time you got back?
Hold on a second, I need to take this call.