If I have a 6% sales tax and I buy a $100 item, how much will the total cost be?

To calculate the total cost of an item with sales tax, you need to add the sales tax to the original price. In this case, the item costs $100 and the sales tax is 6%, so you would calculate:

$100 + ($100 x 0.06) = $106

So the total cost of the item with sales tax is $106.

Note that sales tax rates vary by state and even by city, so it's important to check your local tax rates to ensure you're calculating the correct amount. Additionally, some items may be exempt from sales tax, such as groceries or prescription medications, so it's important to understand which items are taxable in your area.