Hi,
See the screenshot:
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If you apply this arithmetic operation to add TAX on your store, everything will be good to go (which is how things are in U.S -- TAX won't be added to product individually, it is added to BILL)
The result will be:
The product total will be displayed as: $550 ("SUB TOTAL", before TAX)
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while the GRAND TOTAL will be displayed as $605 (i"TOTAL", included TAX - which is what GRAND TOTAL actually means)
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Alternatively, you can put a small text note below the GRAND TOTAL label, something like "included TAX" but i am sure all Americans would understand what it is. Maybe adding an another row above the GRAND TOTAL row to display the "TAX amount" would be a better idea though, but that feature is not supported by our template. You need some hard-coded lines in the cart PHP file to display it.
Regards