| 1000 | ( | 1 | + | m | ) | ( | 1 | + | m | ÷ | 200 | ) | = | 660000 |
| Left side of the equation = | 1000 | × | 1 | ( | 1 | + | m | ÷ | 200 | ) | + | 1000 | m | ( | 1 | + | m | ÷ | 200 | ) |
| = | 1000 | ( | 1 | + | m | ÷ | 200 | ) | + | 1000 | m | ( | 1 | + | m | ÷ | 200 | ) |
| = | 1000 | × | 1 | + | 1000 | m | ÷ | 200 | + | 1000 | m | ( | 1 | + | m | ÷ | 200 | ) |
| = | 1000 | + | 5 | m | + | 1000 | m | ( | 1 | + | m | ÷ | 200 | ) |
| = | 1000 | + | 5 | m | + | 1000 | m | × | 1 | + | 1000 | m | m | ÷ | 200 |
| = | 1000 | + | 5 | m | + | 1000 | m | + | 5 | m | m |
| = | 1000 | + | 1005 | m | + | 5 | m | m |
| 1000 | + | 1005 | m | + | 5 | m | m | = | 660000 |