A rectangular parallelepiped with a square base

d $=0\mathrm{.}255$ m

on a side and a height

h $=0\mathrm{.}120$ m

has a mass

m $=5\mathrm{.}90$ kg$.$

While this object is floating in water, oil with a mass density

$$o $=710$ kg$/$m$3$

is carefully poured on top of the water until the situation looks like that shown in the figure. Determine the height of the parallelepiped in the water.