Answer:
multiply the sales tax percentage against the original cost of the purchase and then add it to that total
Explanation:
If you are a seller and need to add the sales tax you will do as follow:
before-tax sales price x ( 1+ sales tax rate) = after tax sales price
for example:
given pre-tax sales price of 100 dollars and a tax rate of 7.25%
100 x ( 1 + 0.0725) = 107,25
if you a buyer and wants to know how much sales tax you piad you will do as follow:
[tex]\frac{nominal}{1+ tax-rate}[/tex]
using the same value as before:
[tex]\frac{107.25}{1+ 0.0725} = 100[/tex]
And now subtract to get the amoutn of taxes paid:
107,25 - 100 = 7.25
