Sumwise

What is 20% off 100?

20% off 100 = 80 (you save 20)

Sale price
80
You save
20
You pay
80%
Original
100

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: 20% of 100 = 0.2 × 100 = 20
  2. Take it off the price: 100 − 20 = 80
  3. Check: Add the saving back: 80 + 20 = 100.

Another method. In one step: you pay 80% of the price, so 0.8 × 100 = 80. Both methods always give the same answer.

In a spreadsheet: =100*(1-20%). 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 20% off, you pay 80% of the price: 80 instead of 100, a saving of 20.

Shopping: an item marked $100 with 20% off costs $80 at the till, before any sales tax.

Stacked discounts

20% off followed by another 20% off is 36% off in total, not 40%: the second discount applies to the lower price.

Related results

Results for nearby numbers
10% off 100

10% off 100 = 90 (you save 10)

15% off 100

15% off 100 = 85 (you save 15)

25% off 100

25% off 100 = 75 (you save 25)

30% off 100

30% off 100 = 70 (you save 30)

40% off 100

40% off 100 = 60 (you save 40)

50% off 100

50% off 100 = 50 (you save 50)

The other way round: 20% of 100. Two discounts do not add up: 20% off and then another 20% off leaves 64, not 60, because the second discount is taken of the lower price.

Practice

5% off 35
Show answer

5% off 35 = 33.25 (you save 1.75)

25% off 65
Show answer

25% off 65 = 48.75 (you save 16.25)

27% off 78
Show answer

27% off 78 = 56.94 (you save 21.06)

16% off 41
Show answer

16% off 41 = 34.44 (you save 6.56)

86% off 98
Show answer

86% off 98 = 13.72 (you save 84.28)

33% off 58
Show answer

33% off 58 = 38.86 (you save 19.14)

Calculate another

How answers are calculated and checked: methodology.

Questions

What is 20% off 100?

20% off 100 is 80: you save 20. Formula and steps for the sale price.

How much do I save with 20% off 100?

20. That is 20% of 100.

What was the price before 20% off if I paid 80?

100. Divide what you paid by 0.8, the share of the price that is left.