A water heating system has a fully mixed tank of capacity 400 liters. The tank is located in a building having a temperature of 19C. The collector area is 5.0 m. The tank area-loss coefficient product (UA), = 0.81 W/C, Fr(Ta) = 0.76, and FRUL = 4.80 W/m C. In a particular hour when the ambient temperature is 12C, the radiation on the plane of the collector is 18.0 MJ. The load on the system is 5.20 MJ. If the tank temperature is 43C at the beginning of the hour, estimate the temperature at the end of the hour.