What is 20% of 150?
20% of 150 is 30. Adding it gives 180; taking it off gives 120.
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The numbers for these inputs
| Percent | Of the number | Number plus it | Number minus it |
|---|---|---|---|
| 5% | 7.5 | 157.5 | 142.5 |
| 10% | 15 | 165 | 135 |
| 15% | 22.5 | 172.5 | 127.5 |
| 20% | 30 | 180 | 120 |
| 25% | 37.5 | 187.5 | 112.5 |
| 30% | 45 | 195 | 105 |
| 40% | 60 | 210 | 90 |
| 50% | 75 | 225 | 75 |
How it works
A percent is a part of 100, so X percent of a number is the number x X / 100. For 15 percent of 80: 80 x 15 / 100 = 12.
To add a percent (a price rise, a tip, a tax), multiply by 1 + X/100. To take it off (a discount), multiply by 1 - X/100.
The table shows the same number at common percentages so you can compare at a glance.
Common mistakes
- Adding a percent and then taking the same percent off: +20% then -20% does not return to the start, it leaves you 4% lower.
- Mixing up percent and percentage points: going from 10% to 12% is 2 points, but a 20% increase.
- Taking a percent of the wrong base, for example a discount of the final price instead of the original.
Questions
What is 20 percent of 150?
30. It is 150 x 20 / 100.
What is 150 plus 20 percent?
180.
What is 150 minus 20 percent?
120, for example a 20% discount on a price of 150.
30 is what percent of 150?
20%. Divide the part by the whole and multiply by 100.