There is no one tax rate- it is different in different places and for different things. Unless you tell us where you are, and what you are buying, it is not possible to give you a real answer.
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what is 29.88 plus tax
212 + (21/3) = 219.
How much is 349 plus 0.6 tax
It depends on the tax rate. If tax is say 8.25% then 39.99 plus tax is 39.99 + 0.0825(39.99), which rounds to 43.29.
It will be $7.50 plus ($7.50 x (tax rate)). If you have a tax rate of 6% it would be $7.95.