Two drivers G and H are at depths 20m and 40m r... - JAMB Physics 2020 Question

Two drivers G and H are at depths 20m and 40m, respectively below the water surface in a lake. The pressure on G is O${}_1$ while the pressure on H is P${}_2$, If the atmospheric pressure is equivalent to 10m${}^2$ of water, then the value of P${}_2$/P${}_1$ is