Sumwise

What is 10% off 20?

10% off 20 = 18 (you save 2)

Sale price
18
You save
2
You pay
90%
Original
20

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 20 = 0.1 × 20 = 2
  2. Take it off the price: 20 − 2 = 18
  3. Check: Add the saving back: 18 + 2 = 20.

Another method. In one step: you pay 90% of the price, so 0.9 × 20 = 18. Both methods always give the same answer.

In a spreadsheet: =20*(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: 18 instead of 20, a saving of 2.

Shopping: an item marked $20 with 10% off costs $18 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 20

15% off 20 = 17 (you save 3)

20% off 20

20% off 20 = 16 (you save 4)

25% off 20

25% off 20 = 15 (you save 5)

30% off 20

30% off 20 = 14 (you save 6)

40% off 20

40% off 20 = 12 (you save 8)

50% off 20

50% off 20 = 10 (you save 10)

The other way round: 10% of 20. Two discounts do not add up: 10% off and then another 10% off leaves 16.2, not 16, because the second discount is taken of the lower price.

Practice

2% off 15
Show answer

2% off 15 = 14.7 (you save 0.3)

43% off 63
Show answer

43% off 63 = 35.91 (you save 27.09)

93% off 98
Show answer

93% off 98 = 6.86 (you save 91.14)

80% off 25
Show answer

80% off 25 = 5 (you save 20)

11% off 63
Show answer

11% off 63 = 56.07 (you save 6.93)

60% off 70
Show answer

60% off 70 = 28 (you save 42)

Calculate another

How answers are calculated and checked: methodology.

Questions

What is 10% off 20?

10% off 20 is 18: you save 2. Formula and steps for the sale price.

How much do I save with 10% off 20?

2. That is 10% of 20.

What was the price before 10% off if I paid 18?

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