A u-tube differential manometer connects two pipes A and B. Pipe A contains a fluid with sp.gr. 1.594 under a pressure of 11.772 N/cm2 and pipe B contains oil of sp.gr. 0.8 under a pressure of 11.772 N/cm2. The pipe A lies 2.5 m above pipe B. Find the difference in pressure measured by Hg as fluid filling the u-tube.