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Coding tips and build notes by Mahir Faysal, a student web developer in Bangladesh: tested Python, HTML, CSS, JavaScript and PHP tutorials, plus notes from my Next.js and Gemini projects. Sample posts are marked and drafts stay in the admin area.
To calculate sales tax backwards, divide the total you paid by 1 plus the tax rate as a decimal. That gives you the pre-tax price, and the difference between the two is the tax. For a $107 receipt at 7%, $107 ÷ 1.07 = $100, so the tax was $7.
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