Sumwise

What is 10% off 40?

10% off 40 = 36 (you save 4)

Sale price
36
You save
4
You pay
90%
Original
40

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 40 = 0.1 × 40 = 4
  2. Take it off the price: 40 − 4 = 36
  3. Check: Add the saving back: 36 + 4 = 40.

Another method. In one step: you pay 90% of the price, so 0.9 × 40 = 36. Both methods always give the same answer.

In a spreadsheet: =40*(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: 36 instead of 40, a saving of 4.

Shopping: an item marked $40 with 10% off costs $36 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 40

15% off 40 = 34 (you save 6)

20% off 40

20% off 40 = 32 (you save 8)

25% off 40

25% off 40 = 30 (you save 10)

30% off 40

30% off 40 = 28 (you save 12)

40% off 40

40% off 40 = 24 (you save 16)

50% off 40

50% off 40 = 20 (you save 20)

The other way round: 10% of 40. Two discounts do not add up: 10% off and then another 10% off leaves 32.4, not 32, because the second discount is taken of the lower price.

Practice

3% off 45
Show answer

3% off 45 = 43.65 (you save 1.35)

95% off 47
Show answer

95% off 47 = 2.35 (you save 44.65)

56% off 94
Show answer

56% off 94 = 41.36 (you save 52.64)

95% off 61
Show answer

95% off 61 = 3.05 (you save 57.95)

34% off 80
Show answer

34% off 80 = 52.8 (you save 27.2)

72% off 11
Show answer

72% off 11 = 3.08 (you save 7.92)

Calculate another

How answers are calculated and checked: methodology.

Questions

What is 10% off 40?

10% off 40 is 36: you save 4. Formula and steps for the sale price.

How much do I save with 10% off 40?

4. That is 10% of 40.

What was the price before 10% off if I paid 36?

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