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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.
Stacked discounts multiply rather than add. To find the final price, multiply the original price by (1 − first discount) and then by (1 − second discount). So 20% off followed by an extra 10% off gives 0.8 × 0.9 = 0.72 of the price, which is 28% off, not 30%.
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