Food in China and Money Conversion

Several have told me this is one of the best/safest places to order food from while in Guangzhou, China if we visit here.
http://www.dannysbagel.com/
The menu looks good and the prices aren't too bad. If I go by the conversion rule of half and half and half, then it looks like the cheese steak sub is about $4. I've been told they take US Money too.