30% Off $9.99 — You Pay $6.99
30% of $9.99 is $3.00, so the price drops from $9.99 to $6.99. Below are the same figure with sales tax added, what happens if a second discount stacks on top, and the full tier table for this price so you can compare without retyping it.
The arithmetic, line by line
| Step | Calculation | Result |
|---|---|---|
| Discount rate as a decimal | 30 ÷ 100 | 0.30 |
| Discount amount | $9.99 × 0.30 | $3.00 |
| Final price | $9.99 − $3.00 | $6.99 |
| Price paid, share of original | $6.99 ÷ $9.99 × 100 | 70% |
At $0.10 per percentage point, the 10-point move up to 40% changes the saving by $1.00 on a single unit. Two units bought at 30% save $6.00 between them, which is $2.00 more than one unit at 40% ($4.00) — quantity and discount rate are separate levers and they do not trade evenly.
With sales tax on top
Tax is charged on the discounted amount, so the rate applies to $6.99 rather than $9.99.
| Tax rate | You pay | Tax portion |
|---|---|---|
| 5% | $7.34 | $0.35 |
| 6% | $7.41 | $0.42 |
| 7% | $7.48 | $0.49 |
| 8% | $7.55 | $0.56 |
| 9% | $7.62 | $0.63 |
| 10% | $7.69 | $0.70 |
If a second discount stacks
"Take an extra 20% off sale prices" is a second cut on the already-reduced price, not on the original. That is why the totals below do not add up to 40% or 50%.
| Second discount | Price after 30% | After the extra cut | Combined |
|---|---|---|---|
| Extra 10% off | $6.99 | $6.29 | 37% total |
| Extra 20% off | $6.99 | $5.59 | 44% total |
Every discount on $9.99
| Off | You pay | You save |
|---|---|---|
| 10% | $8.99 | $1.00 |
| 15% | $8.49 | $1.50 |
| 20% | $7.99 | $2.00 |
| 25% | $7.49 | $2.50 |
| 30% | $6.99 | $3.00 |
| 40% | $5.99 | $4.00 |
| 50% | $5.00 | $5.00 |
| 60% | $4.00 | $5.99 |
| 70% | $3.00 | $6.99 |
| 75% | $2.50 | $7.49 |
30% off nearby prices
| Original price | Final price | Savings |
|---|---|---|
| $4.99 | $3.49 | $1.50 |
| $14.99 | $10.49 | $4.50 |
| $19.99 | $13.99 | $6.00 |
| $24.99 | $17.49 | $7.50 |
Frequently asked
What is 30% off $9.99?
$6.99. The discount is 30% of $9.99, which is $3.00, and that comes straight off the price: $9.99 − $3.00 = $6.99.
How much do I save at 30% off $9.99?
$3.00 on a $9.99 item, which is the 30% that comes off before the till total of $6.99. The share you still pay is 70%, and sales tax is charged on that smaller figure rather than on the original.
Is 30% off plus another 30% off the same as 60% off?
No. Stacked percentages multiply, so 30% then 30% is 51% off in total, not 60%. On $9.99 the first cut leaves $6.99, and a second 30% takes it to $4.90.
Does sales tax apply before or after the discount?
After, in every US state that taxes the sale. Tax is charged on what you actually pay, so at 8% you owe $7.55 on a $6.99 subtotal, not 8% of $9.99. There are exceptions for manufacturer coupons and mail-in rebates, but a shelf discount is applied first.