| 500 | ( | 1 | + | m% | ) | × | 1000 | ( | 1 | + | 5 100 | ) | = | 660000 |
| 方程左边 = | 500000 | ( | 1 | + | m% | ) | ( | 1 | + | 5 100 | ) |
| 500000 | ( | 1 | + | m% | ) | ( | 1 | + | 5 100 | ) | = | 660000 |
| 方程左边 = | 500000 | × | 1 | ( | 1 | + | 5 100 | ) | + | 500000 | × | m% | ( | 1 | + | 5 100 | ) |
| = | 500000 | ( | 1 | + | 5 100 | ) | + | 5000 | m | ( | 1 | + | 5 100 | ) |
| = | 500000 | × | 1 | + | 500000 | × | 5 100 | + | 5000 | m | ( | 1 | + | 5 100 | ) |
| = | 500000 | + | 25000 | + | 5000 | m | ( | 1 | + | 5 100 | ) |
| = | 525000 | + | 5000 | m | ( | 1 | + | 5 100 | ) |
| = | 525000 | + | 5000 | m | × | 1 | + | 5000 | m | × | 5 100 |
| = | 525000 | + | 5000 | m | + | 250 | m |
| = | 525000 | + | 5250 | m |
| 525000 | + | 5250 | m | = | 660000 |
| 5250 | m | = | 660000 | − | 525000 |
| 5250 | m | = | 135000 |
| m | = | 135000 | ÷ | 5250 |
| = | 135000 | × | 1 5250 |
| = | 180 | × | 1 7 |
| m | = | 180 7 |
| m | = | 25.714286 |