If I have a total sales figure of 6645.16 (which includes sales tax) and I want to figure out what my sales is prior to sales tax, (the sales tax rate is 7%) (answer)
The total sales figure is =107%. Your sales before tax is =100%. Use the ratio relationship to fine the sales before tax. 6645.16/107 = x(sales before tax)/100 Solve for x gives you 6210.43! Check you answer 7% of 6210.43 = 434.73. Total with tax = 6645.16!