Solve correctly I will upvote

An air refrigeration cycle compresses air from 20 C and 101 kPa to 400 kPa in a 50 % compressor efficiency. The air is cooled to - 3 degrees * C in a constant pressure process before entering a turbine with an isentropic efficiency of 70% and assuming air is an ideal gas. Determine the pressure after leaving the air cooler/heat exchanger or the pressure before entering the turbine