The easiest thing to do is to quote the price in your local currency. Go the extra step and convert it to a currency they understand.
If you are not sure what currency to use, just use US Dollars, which is the international currency.
Of course, if you are dealing with somebody regularly, then you should know their preferred currency.
Domestic Transactions
Use local currency. E.g. Australian company billing someone in Australia:
Our price is $1,000
Figure: Bad example - The client doesn't know whether it's AUD or USD
Our price is AUD $1,000
Figure: Good example - AUD makes it more clear
International Transactions
Known Local Currency
Use their local currency. E.g. Chinese company billing someone in Australia:
Our price is CNY ¥1,000
Figure: Bad example - The client will need to convert it
Our price is CNY ¥1,000 (about AUD $160)
Figure: Good example - AUD gives a clear understanding of the costs
Unfamiliar Local Currency
Use USD. E.g. Chinese company billing someone in Brazil.
Our price is CNY ¥1,000
Figure: Bad example - The client will need to convert it
Our price is CNY ¥1,000 (about USD $160)
Figure: Good example - USD gives a clear understanding of the costs
