2) (25 poinfs) An oil tank is connected to a pressure gage through a double-U manometer, as shown in the pieture below. The reading of the pressure gage of the oil tank at the point J is Pi=250kPa, all liquids (water, oil, and mercury) are incompressible: The effeet of air column on pressure is negligible. Determine the gage pressure [kPa] at the point (PA=?7?). (Note: the density of water to be w=1000kg/m3; take the gravity g=9.81m/s2; the specifie gravities of oil and mereury are 0,88 and 13,6 , respectively)