Calculate the total daily commuter bus subsidy paid by the Nairobi city authority. You are advised to show your working.

| Quantity (million trips) | Price (KES) | Curve / Point |
|---|---|---|
| 2.0 | 80 | Intersection of S and D (original equilibrium) |
| 2.5 | 70 | Intersection of S1 and D (new consumer price) |
| 2.5 | 95 | Point on original supply curve S (producer price) |