Consider a wall that consists of two layers, A and B, with the following values: k subscript A equals 0.8 space w divided by m to the power of o c comma space L subscript A equals 8 space c m comma space k subscript B equals 0.2 space w divided by m to the power of o c comma space a n d space space L subscript B equals 5 space c m. If the temperature drop across the wall is 8 to the power of o c , the rate of heat transfer through the wall per unit area of the wall in w divided by m squared is