| 500 | ( | 1 | + | a% | ) | ( | 100 | − | a | ) | + | 1000 | ( | 1 | + | 3 | × | a% | ) | × | 5 | = | 55000 |
| 方程左边 = | 500 | ( | 1 | + | a% | ) | ( | 100 | − | a | ) | + | 5000 | ( | 1 | + | 3 | × | a% | ) |
| 500 | ( | 1 | + | a% | ) | ( | 100 | − | a | ) | + | 5000 | ( | 1 | + | 3 | × | a% | ) | = | 55000 |
| 方程左边 = | 500 | × | 1 | ( | 100 | − | a | ) | + | 500 | × | a% | ( | 100 | − | a | ) | + | 5000 | ( | 1 | + | 3 | × | a% | ) |
| = | 500 | ( | 100 | − | a | ) | + | 5 | a | ( | 100 | − | a | ) | + | 5000 | ( | 1 | + | 3 | × | a% | ) |
| = | 500 | × | 100 | − | 500 | a | + | 5 | a | ( | 100 | − | a | ) | + | 5000 | ( | 1 | + | 3 | × | a% | ) |
| = | 50000 | − | 500 | a | + | 5 | a | ( | 100 | − | a | ) | + | 5000 | ( | 1 | + | 3 | × | a% | ) |
| = | 50000 | − | 500 | a | + | 5 | a | × | 100 | − | 5 | a | a | + | 5000 | ( | 1 | + | 3 | × | a% | ) |
| = | 50000 | − | 500 | a | + | 500 | a | − | 5 | a | a | + | 5000 | ( | 1 | + | 3 | × | a% | ) |
| = | 50000 | − | 0 | a | − | 5 | a | a | + | 5000 | ( | 1 | + | 3 | × | a% | ) |
| = | 50000 | − | 5 | a | a | + | 5000 | × | 1 | + | 5000 | × | 3 | × | a% |
| = | 50000 | − | 5 | a | a | + | 5000 | + | 150 | a |
| = | 55000 | − | 5 | a | a | + | 150 | a |
| 55000 | − | 5 | a | a | + | 150 | a | = | 55000 |