10% Off: sale price, savings and the reverse calculation
At 10% off, multiply the original price by 0.9 to get the sale price. $24.99 becomes $22.49. Everything else on this page is that one multiplication applied to the prices people actually see.
Take 10% off any price
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How the discount is calculated
saving = original × 10/100
The arithmetic for a 10% discount: saving = price × 0.10; sale price = price − saving. On $24.99 the saving is $2.50 and the sale price is $22.49. For a quick estimate round the price first, then apply 10%.
10% off common prices
| Original price | Price after 10% off | You save |
|---|---|---|
| $9.99 | $8.99 | $1.00 |
| $19.99 | $17.99 | $2.00 |
| $29.99 | $26.99 | $3.00 |
| $49.99 | $44.99 | $5.00 |
| $79.99 | $71.99 | $8.00 |
| $99.99 | $89.99 | $10.00 |
| $149.99 | $134.99 | $15.00 |
| $199.99 | $179.99 | $20.00 |
| $499.99 | $449.99 | $50.00 |
| $999.99 | $899.99 | $100.00 |
A second discount on top of 10%
A second discount on top of 10% is worth less than it looks. 5% more off takes the price from $22.49 to $21.37, so the total saving on $24.99 is $3.62, 14.5% of the original, not 15%.
| Discounts applied | Effective discount | Final price on $24.99 | Not |
|---|---|---|---|
| 10% then 5% more | 14.5% | $21.37 | 15% |
| 10% then 10% more | 19% | $20.24 | 20% |
| 10% then 15% more | 23.5% | $19.12 | 25% |
| 10% then 20% more | 28% | $17.99 | 30% |
| 10% then 25% more | 32.5% | $16.87 | 35% |
Reverse: from the sale price back to the original
To recover the original price from a 10%-off sale price, divide by 0.9. A sale price of $22.49 means an original of $24.99. Adding 10% back to $22.49 would give $24.74, which is too low.
Mental math for 10%
Sellers should read this discount against their margin. At 10% off, a line priced at a 60% gross margin still keeps 55.6% of the sale price; a line at a 30% margin keeps 22.2%, which may be less than its overheads.