A US Dollar is worth about 1.1566 Australian dollars, so an Aussie dollar is worth about 87 cents US.
Of course the real difference is the overall cost of living and there I don't know what the comparison is. Certainly within the US a $15 job is worth a heck of a lot more in TN than it is in NYC, HI or CA. Yet generally if a company has a particular job with a particular client nationwide they pay the same no matter what part of the country you are in.