How to find 9 percent of 80
"Percent" means per hundred, so 9% is the fraction 9/100, or 0.09 as a decimal. Taking 9 percent of 80 means multiplying 80 by that fraction:
9% of 80 = 80 x 9 / 100
= 720 / 100
= 7.2The same answer comes from the decimal form: 80 x 0.09 = 7.2. And because multiplication is commutative, 9% of 80 equals 80% of 9, which is sometimes the easier way to see it in your head.
Mental math shortcut
10% of 80 is 8 (move the decimal one place left), and 1% is 0.8. Build 9% from those pieces: 9 x 0.8 = 7.2.
Nearby percentages of 80
| Percent | Of 80 | 80 minus it | 80 plus it |
|---|---|---|---|
| 1% | 0.8 | 79.2 | 80.8 |
| 4% | 3.2 | 76.8 | 83.2 |
| 5% | 4 | 76 | 84 |
| 8% | 6.4 | 73.6 | 86.4 |
| 10% | 8 | 72 | 88 |
| 14% | 11.2 | 68.8 | 91.2 |
| 15% | 12 | 68 | 92 |
| 18% | 14.4 | 65.6 | 94.4 |
| 20% | 16 | 64 | 96 |
| 25% | 20 | 60 | 100 |
| 30% | 24 | 56 | 104 |
| 50% | 40 | 40 | 120 |
9 percent of other amounts
| Amount | 9% of it |
|---|---|
| 20 | 1.8 |
| 25 | 2.25 |
| 30 | 2.7 |
| 40 | 3.6 |
| 50 | 4.5 |
| 60 | 5.4 |
| 75 | 6.75 |
| 100 | 9 |
| 120 | 10.8 |
| 150 | 13.5 |
Where this comes up
A 9% discount on a 80 price takes off 7.2, leaving 72.8. A 9% tip or tax on 80 adds 7.2, for a total of 87.2. If 80 is a score out of a possible total, 9% of it is the share 7.2 represents. For percent change, reverse percentages, and "X is what percent of Y", use the full percentage calculator.