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How to Calculate General Sales Tax


Divide the sales tax percentage by 100 to get a decimal for the percentage. For instance, if the general sales tax rate equals 5 percent: 5/100 = 0.05.


Multiply the sales tax decimal by the purchase price of the item to calculate the general sales tax amount. For example, a $10 item purchased with a 5 percent sales tax: 10 x 0.05 = 0.50 = $0.50.


Add the sales tax amount to the original purchase price before taxes to determine the total cost including the general sales tax. For the example: $10 + $0.50 = $10.50.

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