We don't know what the rate of tax is in your county, in your city, in your state, and on that particular item. Whatever it is, call it ' T ' percent.
The total cost of the item is [ (299.99) times (1 + .01T)]
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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.
If you have the tax rate, as r% then 9.99*(1+r/100) is the after-tax amount.
You can't calculate this without the tax rate.
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