| Discount rate (%) | Hai | Rungwe | ||
| NPV | BCR | NPV | BCR | |
| 1 | 481334307.6 | 35.98 | 601024420.8 | 63.73 |
| 2 | 376548750.2 | 31.61 | 471356091.6 | 58.25 |
| 3 | 264994725.9 | 25.73 | 333301023.1 | 50.29 |
| 4 | 170861860.8 | 19.32 | 216789591.7 | 40.62 |
| 5 | 103087563.9 | 13.46 | 132883673.6 | 30.64 |
| 6 | 59339178.03 | 8.89 | 78702048.48 | 21.81 |
| 7 | 32949434.64 | 5.70 | 45999740.99 | 14.93 |
| 8 | 17542940.61 | 3.63 | 26891403.19 | 10.06 |
| 9 | 8603285.192 | 2.34 | 15790258.98 | 6.77 |
| 10 | 3357492.982 | 1.54 | 9265555.869 | 4.61 |
| 11 | 213935.7545 | 1.04 | 5347569.898 | 3.19 |
| 12 | −1719296.365 | 0.71 | 2932048.521 | 2.25 |
| 13 | −2941826.936 | 0.50 | 1400047.656 | 1.62 |
| 14 | −3736829.307 | 0.36 | 400484.3238 | 1.18 |
| 15 | −4267754.396 | 0.26 | −269498.3192 | 0.88 |
| 16 | - | - | −729775.6666 | 0.66 |
| IRR (%) | 11.11 | 14.60 | ||