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Sales tax is a percentage of a purchase price collected by governments. It is added to the listed price. In the US, rates vary by state and locality — from 0% (Oregon, Montana) to over 10% combined.
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- 1Tax amount = pre-tax price × (tax rate / 100)
- 2Total price = pre-tax price + tax amount
- 3Back-calculate pre-tax: total / (1 + rate/100)
Worked Examples
Инпут
$80 item, 8% tax
Резултат
Tax: $6.40, Total: $86.40
Инпут
Receipt shows $54.00 with 8% tax
Резултат
Pre-tax: $50.00
54 ÷ 1.08 = 50