How do i do tax on a total?

Question

How do i do tax on a total?

Answer 1

On a total what?

Answer 2

If you know the tax rate, multiply it by the cost of the item to get the tax.  For example, if the tax rate is 5% (that's the same as .05) and an item costs $10, the tax would be $10 times .05, or 50 cents