The math
Final price = original × (1 − discount ÷ 100). A 25% discount on $89.99 saves $22.50, leaving $67.49.
Stacked discounts warning
An extra 20% off a 30% sale is not 50% off — the second discount applies to the already-reduced price, giving 44% off overall. Run the result through the calculator twice to see the true final price.
Frequently asked questions
How do I calculate 25% off a price?
Multiply the price by 0.75 (that is, 1 − 0.25). $80 becomes $60.
Do stacked discounts add together?
No. Each successive discount applies to the reduced price, so 30% + 20% off equals 44% off, not 50%.
Does this include sales tax?
No — tax is usually charged on the discounted price and varies by location.