A pottery kiln uses two power settings during one firing cycle.
| Stage | Power of kiln | Time |
|---|---|---|
| heating | 7.2 kW | 4.0 hours4.0\ \text{hours}4.0 hours |
| holding | 1.8 kW | 2.0 hours2.0\ \text{hours}2.0 hours |
Calculate the total energy transferred by the kiln during one complete firing cycle.
Calculate the average power of the kiln during the complete firing cycle.