| ( | 1 | + | r | ) | ÷ | ( | 1 | + | 3 25 | ) | = | 373 400 |
| Multiply both sides of the equation by: | ( | 1 | + | 3 25 | ) |
| ( | 1 | + | r | ) | = | 373 400 | ( | 1 | + | 3 25 | ) |
| 1 | + | r | = | 373 400 | ( | 1 | + | 3 25 | ) |
| 1 | + | r | = | 373 400 | × | 1 | + | 373 400 | × | 3 25 |
| 1 | + | r | = | 373 400 | + | 1119 10000 |
| 1 | + | r | = | 2611 2500 |
| r | = | 2611 2500 | − | 1 |
| r | = | 111 2500 |