Yes, it turns out it grows based on the screen size. Still, with the browser maximized on my laptop, I see only one where it used to be 5 (or 4 + more).
In Australia, we have a single tax for goods and services, the "GST". It is 10%, (or put otherwise, 1/11 of the price of an item). Only a few categories are excluded, such as fresh food and beverages, healthcare, and education services.
There are a few things with different/additional taxes, but generally tax is pretty transparent here, so prices are usually inclusive of tax.