| ( | ( | 1 | + | m% | ) | × | 300 | ) | ( | ( | 1 | + | m | ÷ | 200 | ) | × | 1000 | ) | = | 660000 |
| 方程左边 = | ( | 1 | + | m% | ) | × | 300 | ( | ( | 1 | + | m | ÷ | 200 | ) | × | 1000 | ) |
| = | 1 | × | 300 | ( | ( | 1 | + | m | ÷ | 200 | ) | × | 1000 | ) | + | m% | × | 300 | ( | ( | 1 | + | m | ÷ | 200 | ) | × | 1000 | ) |
| = | 300 | ( | ( | 1 | + | m | ÷ | 200 | ) | × | 1000 | ) | + | 3 | m | ( | ( | 1 | + | m | ÷ | 200 | ) | × | 1000 | ) |
| = | 300 | ( | 1 | + | m | ÷ | 200 | ) | × | 1000 | + | 3 | m | ( | ( | 1 | + | m | ÷ | 200 | ) | × | 1000 | ) |
| = | 300000 | ( | 1 | + | m | ÷ | 200 | ) | + | 3 | m | ( | ( | 1 | + | m | ÷ | 200 | ) | × | 1000 | ) |
| = | 300000 | × | 1 | + | 300000 | m | ÷ | 200 | + | 3 | m | ( | ( | 1 | + | m | ÷ | 200 | ) | × | 1000 | ) |
| = | 300000 | + | 1500 | m | + | 3 | m | ( | ( | 1 | + | m | ÷ | 200 | ) | × | 1000 | ) |
| = | 300000 | + | 1500 | m | + | 3 | m | ( | 1 | + | m | ÷ | 200 | ) | × | 1000 |
| = | 300000 | + | 1500 | m | + | 3000 | m | ( | 1 | + | m | ÷ | 200 | ) |
| = | 300000 | + | 1500 | m | + | 3000 | m | × | 1 | + | 3000 | m | m | ÷ | 200 |
| = | 300000 | + | 1500 | m | + | 3000 | m | + | 15 | m | m |
| 300000 | + | 1500 | m | + | 3000 | m | + | 15 | m | m | = | 660000 |