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.

Yea, you still can get the info but how many people do really care. I am just saying the people would be more aware on how much they are being taxed. Imo making it obvious like US does would be more helpful even if it is not as convenient

I used to live in Turkey, where taxes on some stuff are insane but most people won't ever know because it is not as obvious. In a similar vein, income tax is also quite hidden in Turkey, at least from yhe perspective of employee

Yeah. It's easy in the EU.

My favorite example of how absurd it can get in the US: one side of my friend's street has 9.5% sales tax, the other side has 7.25%. same state, city, and zip.

Your are right, normally VAT is a fixed integer value. But that is not guaranteed, historically we had decimal values, too. (My father encountered this once at IBM in the time of punch cards - turns out, having to change this on machines with limited RAM is quite difficult, akin to the Y2K problem.)

The UK was 17.5% VAT for years.

We don't break out how much the purchase price was reduced by the use of public goods, so it seems like breaking out the tax would be more misleading than informative.