The water boiler of a Rankine cycle power plant runs at 30 M

The water boiler of a Rankine cycle power plant runs at 3.0 MPa. The highest and lowest temperatures of the plant are 450degree C and 60degree C, respectively. Find the plant efficiency and the efficiency of a Carnot cycle operating with the same temperatures.

efficiency=1-T2/T1=86.67% (for rankine cycle)