Discount
Find a sale price from a single discount, or the real combined rate when discounts stack — because 50% then 20% is 60% off, not 70%.
Single vs. stacked
A single discount is simple: multiply the price by what’s left after the cut. 25% off means you pay 75% — €120 becomes €90. The trap is stacking. When a second discount lands on an already-reduced price, it applies to that smaller number, not the original.
So “50% then 20%” leaves 50% of the price, then 80% of that: 0.5 × 0.8 = 0.40. You pay 40% and save 60% — not the 70% you’d get by adding the two percentages. The gap only widens with more layers.
Coupon-on-sale offers, trade discounts down a supply chain, and “extra % off already-reduced” signage all stack. Reading them as a sum overstates the deal every time. Enter the chain above to see the one rate that actually applies.
Discount questions