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Determine Economical Span for the following data :
| written 6.9 years ago by |
| Span | Cost of one pier (Rs.) | Cost of one SS (Rs.) |
|---|---|---|
| 10 | 25000 | 7000 |
| 15 | 28000 | 13815 |
| 20 | 32500 | 31000 |
| 25 | 33700 | 36000 |
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