Equal masses of water and oil are poured into a thin-walled vessel with vertical walls, H = 27 cm high

Equal masses of water and oil are poured into a thin-walled vessel with vertical walls, H = 27 cm high, completely filling the vessel. Determine the hydrostatic pressure at a distance h = 5 cm from the bottom of the vessel (do not take external pressure into account). The fluids are immiscible. Density of oil 3 m ρ = 800 kg / m, density of water 3 in ρ = 1000 kg / m

Since the density of oils is less than the density of water, they cannot be mixed. Then we will have water in the lower layer, and oil in the upper layer. Then by the formula we get:
Phydr. = p atm. + density * g * h.
Since atmospheric pressure is not taken into account, then:
Phydr. = 800 kg / m * 9.81 * 5 cm = 4000Pa = 4KPa