As one might expect, when you go to a new country you have to adapt to their currency. That means learning to do some mental gymnastics to convert the local currency to your home currency every time you go to pay for something. Simple right?
The official currency in Argentina is the Peso. The three letter code for Argentine Pesos is "ARS". The official exchange rate is around 1 USD = 192 ARS. If you take money out of an ATM or use your credit card you get close to the official exchange rate. So far so good.