That is thre best feature of it, in my opinion. Imagine a big red "17%" at the bottom of every receipt. A tax-and-spend liberal's and lobbyist's nightmare!
I once bought an ice cream cone at an Oberweiss dairy store and at the bottom of the receipt was a line "High Tax $0.13" (i forget the exact amount). I asked the clerk if that was a commentary on sales taxes; the response was that it was merely descriptive, not editorial, as packaged foodstuffs were subject to a lower tax than ready-to-eat.
[nb: in England, many restaurants charge much less for take-away food than eat-in food, since the latter is subject to VAT but the former is not].