HaatBeatHow it's calculated
Final price = Price × (1 − d₁) × (1 − d₂)
d₁ and d₂ are the discounts as decimals. The second discount applies to the already-reduced price.
Assumptions
- The extra discount is applied after the first one.
- Taxes are not included.
Worked example
20% off 1,000 and then a further 10% off gives 720: a total discount of 28%, not 30%.
Questions
Why is 20% plus 10% not 30% off?
The 10% applies to the reduced price, so it saves less than 10% of the original price.
Does the order of the discounts matter?
No. 20% then 10% gives the same final price as 10% then 20%.
Is tax included?
No. Add any sales tax, VAT or GST to the final price if it applies.