Sales Tax Calculator
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Step-by-step derivation
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References
- Rate as decimal: r = p / 100
- Forward (tax-exclusive): T = N × r ; G = N + T = N × (1 + r)
- Reverse (tax-inclusive): N = G / (1 + r) ; T = G − N = G × r / (1 + r)
- Find rate: p = 100 × (G − N) / N ; also p = 100 × T / N ; or p = 100 × T / (G − T)