A $6$ m wide $2\mathrm{.}8$ m high wall is constructed of one layer of common brick $(k=0\mathrm{.}72\frac{W}{m}.C)$ of thickness $20$ cm $,$ one inside layer of light weight plaster $(k=0\mathrm{.}36\frac{W}{m}.C)$ of thickness $1$ cm $,$ and one outside layer of cement based covering $(k=1\mathrm{.}40\frac{W}{m}.C)$ of thickness $2$ cm $.$ The inner surface is exposed to outdoors at $8C$ with a combined convection and radiation heat transfer coefficient of $17\frac{W}{m^2}.C.$ Determine the rate of heat transfer through the wall and temperature drops across the plaster, brick, covering, and surface ambient air $(665\mathrm{.}8$ W $).$