The reduction in mass output of the machine is

Question

A portable compressor is taken from a place where the barometric pressure is 750 mm of Hg and the average intake temperature is 27⁰C to a mountainous region where the barometric pressure is 560 mm of Hg temperature is 7⁰C.  The reduction in mass output of the machine is

(a) 80%                  (b) 60% 

(c) 40%                  (d) 20%