What is 10% of 50?
10% of 50 is 5. Adding it gives 55; taking it off gives 45.
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The numbers for these inputs
| Percent | Of the number | Number plus it | Number minus it |
|---|---|---|---|
| 5% | 2.5 | 52.5 | 47.5 |
| 10% | 5 | 55 | 45 |
| 15% | 7.5 | 57.5 | 42.5 |
| 20% | 10 | 60 | 40 |
| 25% | 12.5 | 62.5 | 37.5 |
| 30% | 15 | 65 | 35 |
| 40% | 20 | 70 | 30 |
| 50% | 25 | 75 | 25 |
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 10 percent of 50?
5. It is 50 x 10 / 100.
What is 50 plus 10 percent?
55.
What is 50 minus 10 percent?
45, for example a 10% discount on a price of 50.
5 is what percent of 50?
10%. Divide the part by the whole and multiply by 100.