Every EU bill should come with the price without VAT (value-added tax) and with the VAT applied, leading to the same result.

The only difference is that the VAT is a certain % depending on your country (mostly 15-25%), making it easy for a merchant to calculate it with a single data point. Percentage is also always a fixed round number, so you can calculate it in your head when you stumble upon "+ VAT" somewhere without providing that data point to the merchant for calculation purposes.