Math question help

A container has a vertical tube, whose inner radius is 12.00 mm, connected to it at its side. An
unknown liquid reaches level A in the container and level B in the tube A????1level A being 5.0 cm
higher than level B. The liquid supports a 20.0 cm high column of oil, between levels B and C,
whose density is 210 kg/m3 . the gauge pressure at level B is closest to