A stationary power plant operating on an ideal Brayton cycle has a pressure ratio of 8. Gas temp is 300k at compressor inlet and 1300k at turbine inlet. Utilizing air standard cycle analysis. Known T at the turbine and compressor are 540k and 770k. nth equals 0.426. Assume compressor and turbine efficiencies of 80% and 85%. A) find nth, T4a? B) what is nth if sum of regenarate efficiency is 80% installed?