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Các câu hỏi thường gặp

›How do I calculate a 30% discount?

Multiply the original price by 0.30 to get the savings, then subtract from the original. Or just type your numbers in.

›Can I stack two discounts (20% + 10%)?

Yes — apply each in sequence. 20% off then 10% off is NOT 30% off; it's 28% (0.8 × 0.9 = 0.72).

›How do I figure the effective discount?

Divide savings by original price, then × 100 for the percentage. So $20 off $80 = 25% effective discount.

›Does it handle tax?

Tax is usually applied to the discounted price. Apply your discount first, then add VAT/sales tax with our VAT calculator.

›Is the calculator free?

Yes — fully free, no signup, runs in your browser.