A reversible cycle executed by 1 mol of an ideal gas for which Cp = (5/2)R and

Question:

A reversible cycle executed by 1 mol of an ideal gas for which Cp = (5/2)R and Cv = (3/2)R consists of the following:
• Starting at T1 = 700 K and P1 =1.5 bar. the gas is cooled at constant pressure to T2 = 350 K.
• From 350 K and 1.5 bar, the gas is compressed isothermally to pressure P2.
• The gas returns to its initial state along a path for which PT = constant,
What is the thermal efficiency of the cycle?