what would the sales tax be of a total 30.75 if the tax is 8.25% and how?

Answer 1

If the 30.75 doesn't include the tax just multiply the 30.75 by 8.25% and add that, 2.54, to the total. Total would be 33.29

If the 30.75 does include the tax just divide the 30.75 by 1.0825 to get the amount before tax, 28.41. If you want to double check this, just multiply 28.41 by 8.25% and add that to the 28.41.

Answer 2

$30.75 divided by 1.0825 and then
multiply the answer by 100 = original price

final answer - if 30.75 is the total including tax

if tax to be added
30.75 x . 0825 = tax

Answer 3

30.75x0.0825=2.53688 or about $2.54