Work out double discount instantly with clear inputs, formula shown and shareable results.
Stacked discounts multiply rather than add: 30% then 20% off is not 50% off but 44%, because the second discount applies to the already reduced price. The gap widens with larger discounts — 50% then 50% is 75% off, not 100%.
Stacked discounts
final = price x (1 - d1) x (1 - d2); effective discount = 1 - (1 - d1)(1 - d2)
No. Multiplication is commutative, so 30% then 20% gives exactly the same result as 20% then 30%.
'Extra 20% off sale prices' sounds larger than the 44% total it actually delivers, and it is genuinely a bigger saving than 20% off list.