
| Activity | A | B | C | D | E |
| Duration (week) | 5 | 6 | 8 | 3 | 4 |
| Crashing cost per week (lakh INR) | 4.0 | 2.5 | 2.0 | 3.0 | 4.0 |

Find the values of $V_{Th}$ & $R_{Th}$ in the given circuit.
An electricity utility company charges ₹7 per kWh. If a 40-watt desk light is left on for 10 hours each night for 180 days, what would be the cost of energy consumption? If the desk light is on for 2 more hours each night for the 180 days, what would be the percentage-increase in the cost of energy consumption?