First you have to know the tax rate.
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15 x .06
Depends how much the tax is. If it were 7 percent, multiple 7 (cents) by 3 and add it to 3 dollars. It would be $3.21.
To find the answer, you need to know the tax rate. Once you know the tax rate, add 100% to it, and multiply it by $170. So: (100% + tax)*170
8 dollars
8% of 800 is 800*8/100 = 64