Sometimes, people have a hard time figuring out the math behind sales taxes. This is especially true when people have the total transaction cost and the total sales tax. To figure out the sales tax percentage, we must do a bit of math, which is very simple and can be done via a phone calculator. Let’s assume that your total transaction with taxes is $106.25 and you know that the shelf price of the products purchased is $100.
The first thing that you do is subtract the cost of the goods from the total. In that case $106.25-$100=$6.25. Now you know that the sales taxes are $6.25. Then you divide the total sales tax by the shelf price of the cost of the goods bought, hence $100. So, ding the math, we have $6.25/$100 = 0.0625. We take the ratio number, and we multiply by 100%. Hence, we get : 0.00625*100%= 6.25%, which is the rate.