An ideal Brayton cycle has a net work output of 150 kJ/kg and a back work ratio of 0.4. If both the turbine and the compressor had an isentropic efficiency of 85 percent, the net work output of the cycle would be
(a) 74 kJ/kg
(b) 95 kJ/kg
(c) 109 kJ/kg
(d) 128 kJ/kg
(e) 177 kJ/kg