| Geometry | Strength | Support | Method |
| P. Tabular & Moderately Steep | L. | X. Unsupported | 1. Cut and Fill |
| Q. Tabular & Flat | M. Moderate | Y. Artificially Supported | 2. Block Caving |
| R. Massive and Steep | N. Weak | Z. -supported | 3. Room and Pillar |
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?