Consider a wall that consists of two layers, A and B, with the following values: kA = 1.2 W/m•ºC, LA = 8 cm, kB = 0.2 W/m•ºC, LB = 5 cm. If the temperature drop across the wall is 18ºC, the rate of heat transfer through the wall per unit area of the wall is
(a) 56.8 W/m2
(b) 72.1 W/m2
(c) 114 W/m2
(d) 201 W/m2
(e) 270 W/m2
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