You can price your products in many different currencies. The available currencies are GBP, EUR, USD, CHF, SGD, AUD, JPY, CAD, SEK, and NOK.
In order to change the currency for your product, navigate to the Tickets and Products module, find and click on the product you'd like to update in the products list, and change the Currency field in the product details page. Remember to save your changes when you're done.