Calculate the thermal efficiency of a simple steam power plant implementing the superheated cycle configuration. Superheated steam enters the turbine at 10 MPa and 680 K. The pressure in the condenser is kept at 0.1 MPa, as the discharged thermal energy is used for district heating. Assume that the water state at the feedwater pump inlet is saturated. The isentropic efficiency of the pump is 0.6, while that of the turbine is 0.87.