You must convert money figures so Australians understand values. It’s no use telling your readers that something costs eight pounds or 2000 yen or 40 roubles or 100 euros, unless you convert it to Australian dollars. And use the WORDS for foreign currency not the signs, like £ for English pounds or ¥ for Japanese yen.
So, write like this: In Tokyo a Big Mac costs 70 yen (A$3.50), while in London it costs four pounds (A$2.25).
Double check, please. For a free, up-to-the-minute, easy-to-use currency converter, log on to www.xe.com
Additionally, Google will give you results if you type “AUD 250 to USD”.