40% of 30 = 12
12
40% of 30 is 12.
The working
30 × 0.4 = 12
Off and on
After the discount18
With it added42
A 40% discount takes off 12, leaving 18. Adding 40% as tax or tip brings it to 42.
The other way round
40 / 30133.3333% rounded
The whole30
40 is 133.3333% of 30. And if 12 is the 40%, the whole was 30.
Other percentages of 30
40% of other numbers
10 → 420 → 825 → 1030 → 1240 → 1650 → 2060 → 2470 → 2875 → 3080 → 3290 → 36100 → 40120 → 48125 → 50150 → 60200 → 80250 → 100300 → 120350 → 140400 → 160500 → 200600 → 240700 → 280750 → 300800 → 320900 → 3601,000 → 4001,200 → 4801,500 → 6002,000 → 8002,500 → 1,0003,000 → 1,2005,000 → 2,0007,500 → 3,00010,000 → 4,00015,000 → 6,00020,000 → 8,00025,000 → 10,00050,000 → 20,000100,000 → 40,000
How to read it
- Percent means hundredths. 15% is 0.15, so multiplying the base by 0.15 gives the answer.
- A discount subtracts, tax or tip adds. For the same 15%, the gap between the two results is twice the value.
- "What percent" is a division: 15 ÷ 200 × 100. When it does not come out even, the figure shown is rounded.
Common questions
Q. What is 40% of 30?
12. That is 30 × 0.4.
Q. What is 30 minus 40%?
18 — you take off 12.
Q. What is 30 plus 40%?
42, the figure with tax or a tip on top.
Q. If 12 is 40%, what is the whole?
30.