Sumwise

What is 10% off 10?

10% off 10 = 9 (you save 1)

Sale price
9
You save
1
You pay
90%
Original
10

Sumwise · Maintained by Theo Abbott (pen name) · automated checks · Data: exact arithmetic; unit definitions from NIST SP 811 · Updated · How the checks work

How to work it out

  1. Work out the discount: 10% of 10 = 0.1 × 10 = 1
  2. Take it off the price: 10 − 1 = 9
  3. Check: Add the saving back: 9 + 1 = 10.

Another method. In one step: you pay 90% of the price, so 0.9 × 10 = 9. Both methods always give the same answer.

In a spreadsheet: =10*(1-10%). Taking the percentage of the price gives the saving, not the price you pay. Subtract it, or multiply by the share that is left.

What the result means

After 10% off, you pay 90% of the price: 9 instead of 10, a saving of 1.

Shopping: an item marked $10 with 10% off costs $9 at the till, before any sales tax.

Stacked discounts

10% off followed by another 10% off is 19% off in total, not 20%: the second discount applies to the lower price.

Related results

Results for nearby numbers
15% off 10

15% off 10 = 8.5 (you save 1.5)

20% off 10

20% off 10 = 8 (you save 2)

25% off 10

25% off 10 = 7.5 (you save 2.5)

30% off 10

30% off 10 = 7 (you save 3)

40% off 10

40% off 10 = 6 (you save 4)

50% off 10

50% off 10 = 5 (you save 5)

The other way round: 10% of 10. Two discounts do not add up: 10% off and then another 10% off leaves 8.1, not 8, because the second discount is taken of the lower price.

Practice

2% off 5
Show answer

2% off 5 = 4.9 (you save 0.1)

88% off 31
Show answer

88% off 31 = 3.72 (you save 27.28)

3% off 57
Show answer

3% off 57 = 55.29 (you save 1.71)

86% off 74
Show answer

86% off 74 = 10.36 (you save 63.64)

57% off 52
Show answer

57% off 52 = 22.36 (you save 29.64)

80% off 38
Show answer

80% off 38 = 7.6 (you save 30.4)

Calculate another

How answers are calculated and checked: methodology.

Questions

What is 10% off 10?

10% off 10 is 9: you save 1. Formula and steps for the sale price.

How much do I save with 10% off 10?

1. That is 10% of 10.

What was the price before 10% off if I paid 9?

10. Divide what you paid by 0.9, the share of the price that is left.