| ( | 500 | ( | 1 | + | m | ) | ) | ( | 1000 | + | 1 2 | m | ) | = | 660000 |
| Left side of the equation = | 500 | ( | 1 | + | m | ) | ( | 1000 | + | 1 2 | m | ) |
| = | 500 | × | 1 | ( | 1000 | + | 1 2 | m | ) | + | 500 | m | ( | 1000 | + | 1 2 | m | ) |
| = | 500 | ( | 1000 | + | 1 2 | m | ) | + | 500 | m | ( | 1000 | + | 1 2 | m | ) |
| = | 500 | × | 1000 | + | 500 | × | 1 2 | m | + | 500 | m | ( | 1000 | + | 1 2 | m | ) |
| = | 500000 | + | 250 | m | + | 500 | m | ( | 1000 | + | 1 2 | m | ) |
| = | 500000 | + | 250 | m | + | 500 | m | × | 1000 | + | 500 | m | × | 1 2 | m |
| = | 500000 | + | 250 | m | + | 500000 | m | + | 250 | m | m |
| = | 500000 | + | 500250 | m | + | 250 | m | m |
| 500000 | + | 500250 | m | + | 250 | m | m | = | 660000 |