Consider a $0\mathrm{.}12$ m high, $8$ m long, and $0\mathrm{.}22$ m thick wall whose representative cross section is as given in the figure below. The thermal conductivity of the various material used, in $\frac{W}{m}.K,$ are $k_A=k_F=2,k_B=8,k_C=20,k_D=15,$ and $k_E=35.$ The left and right surfaces of the wall are maintained at uniform temperatures of $300C$ and $100C,$ respectively. Assuming heat transfer through the wall to be $1-$D$,$ draw the thermal resistance circuit and determine the total resistance through the wall. Disregard any contact resistance at the interfaces.

$(2$ mark$)$