30% of 40 = 12
12
30% of 40 is 12.
The working
40 × 0.3 = 12
Off and on
After the discount28
With it added52
A 30% discount takes off 12, leaving 28. Adding 30% as tax or tip brings it to 52.
The other way round
30 / 4075%
The whole40
30 is 75% of 40. And if 12 is the 30%, the whole was 40.
Other percentages of 40
30% of other numbers
10 → 320 → 625 → 7.530 → 940 → 1250 → 1560 → 1870 → 2175 → 22.580 → 2490 → 27100 → 30120 → 36125 → 37.5150 → 45200 → 60250 → 75300 → 90350 → 105400 → 120500 → 150600 → 180700 → 210750 → 225800 → 240900 → 2701,000 → 3001,200 → 3601,500 → 4502,000 → 6002,500 → 7503,000 → 9005,000 → 1,5007,500 → 2,25010,000 → 3,00015,000 → 4,50020,000 → 6,00025,000 → 7,50050,000 → 15,000100,000 → 30,000
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 30% of 40?
12. That is 40 × 0.3.
Q. What is 40 minus 30%?
28 — you take off 12.
Q. What is 40 plus 30%?
52, the figure with tax or a tip on top.
Q. If 12 is 30%, what is the whole?
40.