In a steam power plant operating on an ideal Rankine cycle, superheated steam enters the turbine at 3 MPa and 350°C. The condenser pressure is 75 kPa. The thermal efficiency of the cycle is ________ percent. Given data: For saturated liquid, at P=75 kPa, h_f = 384.39 kJ/kg, v_f = 0.001037 m³/kg, s_f = 1.213 kJ/kg-K. At 75 kPa, h_fg = 2278.6 kJ/kg, s_fg = 6.2434 kJ/kg-K. At P=3 MPa and T=350°C (superheated steam), h=3115.3 kJ/kg, s=6.7428 kJ/kg-K.