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Say sales tax is 15%.
The formulae will be: 15/(100+15)
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.
divide the receipts by 1 + the sales tax rate like
if receipt 300 , sales rate 7%
sales tax=2/(1+7%)=1.869
