A plane furnace surface at 150°C covered with 1-cm· thick insulation is exposed to air at 30°C, and the combined heat transfer coefficient is 25 W/m2·K. The thermal conductivity of insulation is 0.04 W/m·K. The rate of heat loss from the surface per unit surface area is
(a) 35 W
(b) 414 W
(c)300W
(d) 480 W
(e) 128 W
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