Financial Exchange (FX) Rate

Skype prices most of its services in euros, which is the common currency of the majority of the member countries of the European Union. The symbol for euros is To make the book more palatable to American readers, prices in the book are often given first in euros and then again in U.S. dollars. The conversion factor between any two currencies (not just euros and dollars) commonly is referred to as the financial exchange (FX) rate, or simply FX rate.

Moreover, sometimes it is also common practice to refer to a currency not by name, but rather, by a standardized and unique three-letter code. Every national currency in the world has such a three-letter code. For the euro, the code is EUR, and for the U.S. dollar, it is USD. Sometimes currencies are referred to in the book by their three-letter codes.

FX rates are not constant. In fact, they can and do move around a lot. But because a book is not a "live" document, it must use a fixed exchange rate. Therefore, unless stated otherwise, euro-to-dollar conversions were carried out at this FX rate: 1 EUR = 1.25 USD.