An air-conditioned room has one of the walls, which is 5 m × 3 m of 3.75 cm thick brick. The conditioned space is maintained at 27°C when the outside temperature is 47°C. Variation of thermal conductivity with temperature of the wall is given by k = 1 + 2 × 10⁻⁴ T, where T is in Kelvin and k is in W/mK. The heat gained by the conditioned space through this wall is

1. 8496 W
2. 84.96W
3. 800 W
4. 0