| Feature in mine plan | Symbol | ||
| P | shaft | 1 | ![]() |
| Q | staple shaft | 2 | ![]() |
| R | Abandoned shaft | 3 | ![]() |
| S | Abandoned staple shaft | 4 | ![]() |
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?