Stacked Discount (3 Coupons)
Each discount applies to what is left, so 30% + 20% + 10% is not 60%. Multiply what survives: 0.7 × 0.8 × 0.9 = 0.504, which is 49.6% off.
Your numbers
Real discount
49.6%
Final price
50,400
Discount
49,600
What it means
Not the 60% you get by adding — the real cut is 49.6%, a gap of 10.4 points.
Formula
Final price = List price × (1 − A share) × (1 − B share) × (1 − Percentage)
With percentage discounts the order never changes the answer. Mix in a fixed-amount coupon and it suddenly does.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| List priceThe price before any discount — the "was" price on a receipt. | 100,000 | 0 and up |
| A share (%)The percentage that applies to the first item. | 30 | 0 ~ 100 |
| B share (%)The percentage that applies to the second item. | 20 | 0 ~ 100 |
| Percentage (%)A share expressed out of 100. | 10 | 0 ~ 100 |
Step by step
Quick reference table
Results when only A share (%) changes and everything else stays put.
| A share (%) | Real discount (%) | Final price | Discount |
|---|---|---|---|
| 15 | 38.8 | 61,200 | 38,800 |
| 22.5 | 44.2 | 55,800 | 44,200 |
| 30 | 49.6 | 50,400 | 49,600 |
| 45 | 60.4 | 39,600 | 60,400 |
| 60 | 71.2 | 28,800 | 71,200 |
What each result means
| Result | At default values |
|---|---|
| Real discount (%)Stacked discounts boiled down to one number — always less than adding them. | 49.6 |
| Final priceWhat you pay once discounts and tax are applied. | 50,400 |
| DiscountHow much came off the list price — what you saved. | 49,600 |
Common mistakes
With percentage discounts the order never changes the answer. Mix in a fixed-amount coupon and it suddenly does.
Glossary
- List price
- The price before any discount — the "was" price on a receipt.
- A share
- The percentage that applies to the first item.
- B share
- The percentage that applies to the second item.
- Percentage
- A share expressed out of 100.
- Real discount
- Stacked discounts boiled down to one number — always less than adding them.
- Final price
- What you pay once discounts and tax are applied.
- Discount
- How much came off the list price — what you saved.
Frequently asked questions
Q. How is Stacked Discount (3 Coupons) calculated?
Final price = List price × (1 − A share) × (1 − B share) × (1 − Percentage) — Each discount applies to what is left, so 30% + 20% + 10% is not 60%. Multiply what survives: 0.7 × 0.8 × 0.9 = 0.504, which is 49.6% off.
Q. Can you walk through an example?
With List price 100,000, A share 30%, B share 20%, Percentage 10%, the answer is Real discount 49.6%.
Q. What do I need to enter?
Enter List price, A share, B share, Percentage. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only A share (%) moves the answer to A share (%) 15 → Real discount (%) 38.8 and A share (%) 60 → Real discount (%) 71.2. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
With percentage discounts the order never changes the answer. Mix in a fixed-amount coupon and it suddenly does.
Related calculators
Tax rates and interest conventions differ by country and product — check your contract for real transactions.