If you have the tax rate, as r%
then 9.99*(1+r/100) is the after-tax amount.
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Tax rates vary from place to place. It would be necessary to know what percentage of tax is added.
It depends on where you are because the tax rate is different in different locations. Here in my locality, it would be $437.54
Multiply 269.99 times 0.09 (That's how much tax for one dollar costs these days). Then you get about how much is the tax then add 269.99 again.
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