Sumwise

What is 50% off 20?

50% off 20 = 10 (you save 10)

Sale price
10
You save
10
You pay
50%
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: 50% of 20 = 0.5 × 20 = 10
  2. Take it off the price: 20 − 10 = 10
  3. Check: Add the saving back: 10 + 10 = 20.

Another method. In one step: you pay 50% of the price, so 0.5 × 20 = 10. Both methods always give the same answer.

In a spreadsheet: =20*(1-50%). 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 50% off, you pay 50% of the price: 10 instead of 20, a saving of 10.

Shopping: an item marked $20 with 50% off costs $10 at the till, before any sales tax.

Stacked discounts

50% off followed by another 50% off is 75% off in total, not 100%: the second discount applies to the lower price.

Related results

Results for nearby numbers
10% off 20

10% off 20 = 18 (you save 2)

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)

The other way round: 50% of 20. Two discounts do not add up: 50% off and then another 50% off leaves 5, not 0, because the second discount is taken of the lower price.

Practice

10% off 72
Show answer

10% off 72 = 64.8 (you save 7.2)

26% off 35
Show answer

26% off 35 = 25.9 (you save 9.1)

58% off 46
Show answer

58% off 46 = 19.32 (you save 26.68)

81% off 85
Show answer

81% off 85 = 16.15 (you save 68.85)

37% off 18
Show answer

37% off 18 = 11.34 (you save 6.66)

98% off 77
Show answer

98% off 77 = 1.54 (you save 75.46)

Calculate another

How answers are calculated and checked: methodology.

Questions

What is 50% off 20?

50% off 20 is 10: you save 10. Formula and steps for the sale price.

How much do I save with 50% off 20?

10. That is 50% of 20.

What was the price before 50% off if I paid 10?

20. Divide what you paid by 0.5, the share of the price that is left.