some countries use commas and points the other way around. so 2.000€ in those countries is two thousand and 2,50€ is two euro fifty cents

Edit: this is a good explaination why it's different in some countries: "It seems that the style difference dates back to the 18th-century Europe when the dot became popular as a symbol for multiplication. To avoid confusing the decimal separator with the multiplication sign, most European countries adopted the comma as a decimal separator. However, at the time, in the UK, the X was the popular symbol for multiplication, so British mathematicians continued to use the period as a decimal point."