Answer
Item's total cost\ sales tax rate + sales tax = total cost
Work Step by Step
Multiply the cost of the item by the sales tax rate then add the decimal you get as the answer to the original cost to find your total cost.
Example: A $25 shirt has a 6% tax rate, 25+ 0.06= 1.50, now add the 1.50 the the 25 dollar shirt, 25+1.50= 26.50
