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

A foundation plan of $1m2m$ 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 $BL,$ due to a uniformly distributed load $p=150k\frac{N}{m^2},$ 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 $I_z(m,n)$ is expressed by the following equation and depicted in the chart below, where

Net stress increase $p=150k\frac{N}{m^2}$

Footing size $1m2m$

Sand ${}_t=16\mathrm{.}5k\frac{N}{m^3}$

Groundwater table

Sand ${}_{\text{s}\text{a}\text{t}}=17\mathrm{.}5k\frac{N}{m^3}$

Water ${}_w=9\mathrm{.}8k\frac{N}{m^3}$

Normally consolidated clay ${}_{\text{s}\text{a}\text{t}}=16k\frac{N}{m^3}$

$e_0=0\mathrm{.}8$

$C_c=0\mathrm{.}32$

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

$I_z=\frac{1}{2}(\frac{mn}{\sqrt[\phantom{2}]{m^2+n^2+1}}\frac{m^2+n^2+2}{(m^2+1)(n^2+1)}+si{n}^{-1}(\frac{mn}{\sqrt[\phantom{2}]{m^2+1}\sqrt[\phantom{2}]{n^2+1}}))$

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

$\frac{{}_z^{\text{'}}}{p}=I_z(\frac{B_1}{z},\frac{L_1}{z})+I_z(\frac{B_2}{z},\frac{L_1}{z})+I_z(\frac{B_1}{z},\frac{L_2}{z})+I_z(\frac{B_2}{z},\frac{L_2}{z})$

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.