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Annual cashflow calculation for the economic analysis based on the case study.
| 17 | Gas value based on methane content | $0.22 | $0.26 | $0.30 | $0.34 | $0.39 |
| 18 | Annual income/savings calculation: [17] × [6] × 12 months | $1066.56 | $1260.48 | $1454.4 | $1648.32 | $1890.72 |
| 19 | Annual cashflow calculation: [18] −[9] | $744.16 | $938.08 | $1132 | $1325.92 | $1568.32 |
