Money

Peso (ARS; symbol AR$) = 100 centavos. Peso notes are in denominations of AR$100, 50, 20, 10, 5 and 2. Coins are in denominations of AR$5, 2 and 1, and in 50, 25, 10, 5 and 1 centavos. US Dollars are accepted in some hotels and tourist centres. Confusingly, both peso and dollar prices are often preceded by just ‘$', so check if you are uncertain.

http://www.worldtravelguide.net/country/14/money/South-America/Argentina.html