A single-cylinder, single-acting reciprocating compressor using R-12 as refrigerant has a bore of 80 mm and a stroke of 60 mm. The compressor runs at 1450 rpm. If the suction temperature is 10 °C and the condensing temperature is 50 °C, calculate: (a) the refrigerating capacity (b) power of refrigeration (c) total power required to drive the compressor.