An ideal gas refrigeration cycle using air as the working fluid is to maintain a refrigerated space

Question:

An ideal gas refrigeration cycle using air as the working fluid is to maintain a refrigerated space at -23°C while rejecting heat to the surrounding medium at 27°C. If the pressure ratio of the compressor is 3, determine
(a) The maximum and minimum temperatures in the cycle,
(b) The coefficient of performance, and
(c) The rate of refrigeration for a mass flow rate of 0.08 kg/s.