$$I need detailed help solving this exercise step by step, please.

A foundation plan of $1$m$2$m $$is shown on the right$-$hand side. Answer the following questions.

Using Newmark $(1935)$and Fadum $(1948)\text{'}$s solution for stress distribution within the soil mass beneath the corner of a rectangular foundation with dimensions B$$L$,$due to a uniformly distributed load p$=150$kNm$2,$calculate the average vertical stress increment $$z$\text{'}$at the midpoint of the clay layer, resulting from the net stress increase of p $$carried by the footing. The influence value Iz$($m$,$n$)$is expressed by the following equation and depicted in the chart below, where

Net stress increase p$=150$kNm$2$

Footing size $1$m$2$m

Sand t$=16\mathrm{.}5$kNm$3$

Groundwater table

Sand sat$=17\mathrm{.}5$kNm$3$

Water w$=9\mathrm{.}8$kNm$3$

Normally consolidated clay sat$=16$kNm$3$

e$0=0\mathrm{.}8$

Cc$=0\mathrm{.}32$

B$=$m$*$z$,$L$=$n$*$z $$at depth z $$beneath the plane of the uniform load.

Iz$=12$$($mnm$2+$n$2+1$m$2+$n$2+2($m$2+1)($n$2+1)+$sin$-1($mnm$2+1$n$2+1))$

Note that the vertical stress beneath the foundation at point O and depth z is determined by the principle of superposition, illustrated as follows.

$$z$\text{'}$p$=$Iz$($B$1$z$,$L$1$z$)+$Iz$($B$2$z$,$L$1$z$)+$Iz$($B$1$z$,$L$2$z$)+$Iz$($B$2$z$,$L$2$z$)$

Ignoring the elastic settlement in the sand layer and assuming that $$z$\text{'}$taken at the middle of the clay layer is the representative value, estimate the settlment of the foundation due to the primary consolidation of a $2\mathrm{.}5$m thick, normally consolidated clay layer located at $3$m below the ground surface, with the groundwater table $0\mathrm{.}5$m above the clay layer.