QUES $3(30)($p$)$ A gravity retaining wall is shown in Figure below and is made of concrete. Calculate the factor of safeties with respect to overturning and sliding and soil bearing capacity, given the following data:

USE THE RANKINE ACTIVE EARTH PRESSURE IN YOUR CALCULATION.

The friction angle between soil$-$concrete at bottom of wall is $15$ degree. Unit weight of concrete $24k\frac{N}{m^3}$

${}_{\text{a}\text{l}\text{l}\text{o}\text{w}\text{a}\text{b}\text{l}\text{e}\text{s}\text{o}\text{i}\text{l}\text{b}\text{e}\text{a}\text{r}\text{i}\text{n}\text{g}}=25\frac{t}{m^2})$

$=15$