Ok so I got Pressure of the barometer to be 10231.3 N/m^2 if I multiply 75.23cm with 13.6 x 10^3 kg/m^3, & Pressure of the oil manometer to be 389.5 N/m^2 if multiplied by 950 kg/m^3. Is that the Pressure for P1 and P2 respectively? (For the P1V1/T1 = P2V2/T2)