What is 40% of 75?
40% of 75 is 30. Adding it gives 105; 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% | 3.75 | 78.75 | 71.25 |
| 10% | 7.5 | 82.5 | 67.5 |
| 15% | 11.25 | 86.25 | 63.75 |
| 20% | 15 | 90 | 60 |
| 25% | 18.75 | 93.75 | 56.25 |
| 30% | 22.5 | 97.5 | 52.5 |
| 40% | 30 | 105 | 45 |
| 50% | 37.5 | 112.5 | 37.5 |
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 40 percent of 75?
30. It is 75 x 40 / 100.
What is 75 plus 40 percent?
105.
What is 75 minus 40 percent?
45, for example a 40% discount on a price of 75.
30 is what percent of 75?
40%. Divide the part by the whole and multiply by 100.