Sumwise

What is 30% off 30?

30% off 30 = 21 (you save 9)

Sale price
21
You save
9
You pay
70%
Original
30

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: 30% of 30 = 0.3 × 30 = 9
  2. Take it off the price: 30 − 9 = 21
  3. Check: Add the saving back: 21 + 9 = 30.

Another method. In one step: you pay 70% of the price, so 0.7 × 30 = 21. Both methods always give the same answer.

In a spreadsheet: =30*(1-30%). 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 30% off, you pay 70% of the price: 21 instead of 30, a saving of 9.

Shopping: an item marked $30 with 30% off costs $21 at the till, before any sales tax.

Stacked discounts

30% off followed by another 30% off is 51% off in total, not 60%: the second discount applies to the lower price.

Related results

Results for nearby numbers
10% off 30

10% off 30 = 27 (you save 3)

15% off 30

15% off 30 = 25.5 (you save 4.5)

20% off 30

20% off 30 = 24 (you save 6)

25% off 30

25% off 30 = 22.5 (you save 7.5)

40% off 30

40% off 30 = 18 (you save 12)

50% off 30

50% off 30 = 15 (you save 15)

The other way round: 30% of 30. Two discounts do not add up: 30% off and then another 30% off leaves 14.7, not 12, because the second discount is taken of the lower price.

Practice

6% off 13
Show answer

6% off 13 = 12.22 (you save 0.78)

14% off 78
Show answer

14% off 78 = 67.08 (you save 10.92)

30% off 32
Show answer

30% off 32 = 22.4 (you save 9.6)

56% off 92
Show answer

56% off 92 = 40.48 (you save 51.52)

92% off 84
Show answer

92% off 84 = 6.72 (you save 77.28)

45% off 50
Show answer

45% off 50 = 27.5 (you save 22.5)

Calculate another

How answers are calculated and checked: methodology.

Questions

What is 30% off 30?

30% off 30 is 21: you save 9. Formula and steps for the sale price.

How much do I save with 30% off 30?

9. That is 30% of 30.

What was the price before 30% off if I paid 21?

30. Divide what you paid by 0.7, the share of the price that is left.