No, because my original example was $100, before any tax was added. I'm glad you've overcome your fear.
You seem to not wish to know what the cost (as opposed to price at point of sale)
I was asking specifically about the price at point of sale.
Everyone who buys an item for $100 will see the exact same tax on their receipt. The receipts will not vary according to each persons different effective rate. How would the retailer know my effective rate?
You are clearly talking about a $100 purchase including the FairTax showing on the receipt. I have answered your question - the amount of the real cost to you would be $85.65 due to your effective tax rate.
The fact that you do not like my answer does not matter a bit - it's still the case and shows how the FairTax actually operates - like it or not.