Please help me in the following question

A reciprocating air compressor has two stages and compresses air from 90 kPa and 15 C to a pressure of 7,68 MPa Intercooling is incomplete and the air enters the second stage at 27 C. The intercooler air pressure remains constant at 960 kPa. The low-pressure cylinder has a diameter of 160 mm and the stroke for both cylinders is 150 mm. a. Assume a volumetric efficiency of 82,5% (based on 90 kPa and 15 C) and calculate the mass of air compressed per stroke. (R for air is 0,287kJ/kg.K) b. Calculate the volume of air compressed in the high-pressure cylinder and then calculate its diameter, again assuming a volumetric efficiency of 82,5% c. Calculate the work done per cycle and then calculate the power consumed if the compressor runs at 5r/s. assume an index of compression of 1,33 for both cylinders. a. 0.006 kg; 0.01 ms; 30 mm; 2.653 KW b. 0.002709 kg; 0.00024298 m3: 50 mm; 6.653 kW O c. 1.21 kg; 0.5 m3: 61.5 mm; 5 kW O d. 0.06 kg; 0.032 m3: 24.5 mm; 7.1 KW