$2.$ A U tube manometer is used to measure a pressure drop across equipment. Liquid A is mercury of density $13590$ kg$/$m$3$ and fluid B flowing through the equipment and filling the manometer leads is brine of density $1260$ kg$/$m$3.$ Under operating condition, the pressure at upstream is $0\mathrm{.}14$ bar, the pressure at downstream tap is $250$mm Hg below atmospheric. What is the difference in manometer level?