For the cycle of Problem 9.41, find the cycle thermal efficiency if the compressor and turbine have

Question:

For the cycle of Problem 9.41, find the cycle thermal efficiency if the compressor and turbine have respective isentropic efficiencies of
a) 85% and 80%,
b) 80% and 75%. Determine the percentage decrease in the thermal efficiency of the cycle from that of the ideal cycle.
Air enters a gas turbine cycle at 20°F and 14 psia. It is compressed to 98 psia. The high temperature is 1800°F.