A station has a maximum demand of 80 MW and the daily load curve: 0–6 h 40 MW, 6–8 h 50 MW, 8–12 h 60 MW, 12–14 h 50 MW, 14–18 h 70 MW, 18–22 h 80 MW, 22–24 h 40 MW. (a) Find the load factor of the station. (b) Find the load factor of standby equipment rated 20 MW that takes all the load in excess of 60 MW, and (c) its use factor.