| 1600 | ÷ | ( | 200 | ( | 1 | − | ( | m | ÷ | 100 | ) | ) | ) | = | 81 10 | m |
| Multiply both sides of the equation by: | ( | 200 | ( | 1 | − | ( | m | ÷ | 100 | ) | ) | ) |
| 1600 | = | 81 10 | m | ( | 200 | ( | 1 | − | ( | m | ÷ | 100 | ) | ) | ) |
| 1600 | = | 81 10 | m | × | 200 | ( | 1 | − | ( | m | ÷ | 100 | ) | ) |
| 1600 | = | 1620 | m | ( | 1 | − | ( | m | ÷ | 100 | ) | ) |
| 1600 | = | 1620 | m | × | 1 | − | 1620 | m | ( | m | ÷ | 100 | ) |
| 1600 | = | 1620 | m | − | 1620 | m | ( | m | ÷ | 100 | ) |
| 1600 | = | 1620 | m | − | 1620 | m | m | ÷ | 100 |
| 1600 | = | 1620 | m | − | 81 5 | m | m |