Total pressure at the bottom of cylinder is
P=weight of liquids+weight of cylinderA+P0
P=[Ad(H2)g+A2d(H2)g]+A5(54d)LgA+P0
P=(6H+L4)dg+P0
Here we are asked to find the total pressure at the bottom of the container and not only the hydrostatic pressure; hence, we need to consider the total weight of liquid and cylinder in the container.