A retaining wall 8m high retains sand with $\phi=30^{\circ}$ and $\gamma=24kN/m^{2}$ upto a depth of 4m from the top.

From 4 to 8m, the material is a cohesive soil with having C=20kN/m$^{2}$ and $\phi$=20°, $\gamma=18kN/m^{3}$. The water table is at a depth of 5m from the ground level $\gamma_{sat}=21kN/m^{3}$ for cohesive soil. Find the total active thrust on the wall along with its point of application

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