$4$m thick clay layer under $4$m sand layer Water level is $4$m

A $3$x$4$ rectangular foundation will be constructed on this soil. As a result of the test performed on a sample taken at a depth of $5$ m from the surface, the pre$-$consolidation pressure was calculated as $100$ kPa, Cc $-0\mathrm{.}35,$ Cr$=0\mathrm{.}06.$ If the net vertical stress to be applied to the soil under the foundation is $100$ kPa, calculate the amount of consolidation settlement that will occur in the clay layer. For clay soil, eo is $-1\mathrm{.}10.$ The unit weight of sand is y $17\mathrm{.}5$ kN$/$m and the unit weight of clay is Y$-16\mathrm{.}5$ kN$/$m$.($The text in the photo is in Turkish Pay attention$)$