The $4.60 is correct amount of tax in both the tax inclusive (23%) and tax exclusive (30%) calculationsExcept how do you calculate the 23% without using the 30% and a better question is why would I want to?
...Suppose the inclusive rate was 23.375%, how am I, the consumer supposed to know how much money I need to make the $15.40 purchase?...
Using the inclusive rate for sales is deceitful...period.
As has been told to you several time on these threads, the tax inclusive rate is how income taxes are compared at different levels (tax brackets for federal and state income taxes), thus is the reason for using tax inclusive (23%) to compare the FairTax to the income tax. And, it has also been told to you several times that many and perhaps most sales tags will exclude the tax and leave the calculation up to the consumer who will use the tax exclusive rate (30%). As I said, you already know all of this. Yet you refuse to acknowledge the usefulness and utility of the 23% inclusive rate.
The inclusive rate is just fine Looey. YOU are deceitful.