I'm not sure if I understand your question, but will try to help you. If you are talking about Australia, the unit of currency is the Australian dollar, usually called AUD. This is worth slightly less than the US dollar and today (26 July 2013) it is trading at 0.93 to the dollar one AUD is 100 cents as with the USD), or 0.60 to the British pound sterling. You can always find the worth at any one time if you type 'convert aud to usd' in a search engine.
The AUD is also used in nearby states such as Tuvalu and Nauru. It is an important currency on the world markets - traders like it because the Australian interest rate is high and there is relatively little government regulation. It is in fact the 5th most traded currencies in the world, just after the US dollar, the euro, yen and sterling.
If this wasn't your question, please ask again in a bit more detail and I'm sure someone will be able to help you.