What does this tool do?
Percentage discounts apply one after another, each to the already-reduced price. A fixed coupon is then subtracted, which is why the order of operations matters.
The Formula
Final = Price × (1 − d1) × (1 − d2) − CouponFrequently Asked Questions
Does the order of percentage discounts matter?
For two percentage discounts, no: 20% then 10% gives the same result as 10% then 20%. A fixed coupon applied before percentages does change the total.
Why is 20% + 10% not 30% off?
The second discount applies to the reduced price. The combined effect is 28% off, not 30%.