How do you calculate a sales tax if you know the sales tax rate and the item's cost?

To calculate the sales tax that is included in a company's receipts from items subject to sales tax, divide the receipts by 1 + the sales tax rate. For example, if the sales tax rate is 6%, divide the total amount of receipts by 1.06. If the sales tax rate is 7.25%, divide the total receipts by 1.0725.

This website has 4 ways to find it.

https://www.wikihow.com/Calculate-Sales-Tax

Hope this helped! Good luck!

Step-by-step explanation:

To solve for s, you need to follow these steps.

First multiply by t both sides of the equation.

We get

Now we divide by r, both sides of the equation.

Finallly we obtain:

or