Hello to Addison4 I've just had the same query and then eventually worked it out. You've probably done the same by now, but this might help someone else. If you were adding tax at 10% to a product costing $19.99, then the tax would be $1.99 and the total cost of the product would go up to £21.98. If 10% tax is already included in the total price of $19.99 though, then you have to divide this total by 110 in order to calculate 1% of the original product price. Once you know what 1% is (in this case $0.1817) Then you can multiply your 1% by 100 to calculate your pre-tax product price ($0.1817 x 100 = $18.17) Or multiply your 1% by 10 to calculate the tax on this product ($0.1817 x 10 = £1.82) I found this online tool which does the same calculation faster. Just set your rate of tax then either add or, as in your case, remove it from the price of the product. http://www.vatcalculator.co.uk/ Hopefully helpful! Cheers.
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