| 400000 | = | 20000 | P | ( | 1 | − | 5 100 | ) | − | 600000 |
| Right side of the equation = | 20000 | P | × | 1 | − | 20000 | P | × | 5 100 | − | 600000 |
| = | 20000 | P | − | 1000 | P | − | 600000 |
| = | 19000 | P | − | 600000 |
| 400000 | = | 19000 | P | − | 600000 |
| - | 19000 | P | = | - | 600000 | − | 400000 |
| - | 19000 | P | = | - | 1000000 |
| 1000000 | = | 19000 | P |
| 19000 | P | = | 1000000 |
| P | = | 1000000 | ÷ | 19000 |
| = | 1000000 | × | 1 19000 |
| = | 1000 | × | 1 19 |
| P | = | 1000 19 |
| P | = | 52.631579 |