Currency

Preferred Form
Australia is a relatively safe place to carry reasonable amounts of cash and currency is easy to exchange. Otherwise most travellers will have no problems using major credit cards as they are commonly accepted for transactions in most places.

Tipping
Tipping is becoming more widespread in Australia, principally in the major centres where there's been more foreign influence. However, it's certainly not expected in any restaurant. You should tip in a restaurant (not in a simple café) if you feel you have received exceptional service.

Currency Notes
The lowest denomination dollar bill note is $5.00 and is purple
The $10.00 note is blue
The $20.00 note is orange
The $50.00 note is dark yellow
The $100.00 note is green 

Currency Coins
Coins come in the denominations of 5, 10, 20, and 50 cent pieces (silver), followed by gold $1.00 coins and $2.00 coins.