| P | ( | 1 | + | 8 100 | ) | + | ( | 1 | − | P | ) | ( | 1 | + | 8 100 | ) | × | 40 100 | = | 1 | + | 3 100 |
| Left side of the equation = | P | × | 1 | + | P | × | 8 100 | + | ( | 1 | − | P | ) | ( | 1 | + | 8 100 | ) | × | 40 100 |
| = | 27 25 | P | + | ( | 1 | − | P | ) | ( | 1 | + | 8 100 | ) | × | 40 100 |
| = | 27 25 | P | + | 1 | ( | 1 | + | 8 100 | ) | × | 40 100 | − | P | ( | 1 | + | 8 100 | ) | × | 40 100 |
| = | 27 25 | P | + | 2 5 | ( | 1 | + | 8 100 | ) | − | P | ( | 1 | + | 8 100 | ) | × | 40 100 |
| = | 27 25 | P | + | 2 5 | × | 1 | + | 2 5 | × | 8 100 | − | P | ( | 1 | + | 8 100 | ) | × | 40 100 |
| = | 27 25 | P | + | 2 5 | + | 4 125 | − | P | ( | 1 | + | 8 100 | ) | × | 40 100 |
| = | 27 25 | P | + | 54 125 | − | P | ( | 1 | + | 8 100 | ) | × | 40 100 |
| = | 27 25 | P | + | 54 125 | − | P | × | 1 | × | 40 100 | − | P | × | 8 100 | × | 40 100 |
| = | 27 25 | P | + | 54 125 | − | P | × | 2 5 | − | P | × | 4 125 |
| = | 81 125 | P | + | 54 125 |
81 125 | P | + | 54 125 | = | 1 | + | 3 100 |
| Right side of the equation = | 103 100 |
81 125 | P | + | 54 125 | = | 103 100 |
81 125 | P | = | 103 100 | − | 54 125 |
81 125 | P | = | 299 500 |
| P | = | 299 500 | ÷ | 81 125 |
| = | 299 500 | × | 125 81 |
| = | 299 4 | × | 1 81 |
| P | = | 299 324 |
| P | = | 0.92284 |