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At Rs. X per kWh how much will it cost to maintain a temperature of 35?C for 24 hours in a box 0.5 m square on each side if the outside temperature is 20?C and the overall heat transfer coefficient for the box is 0.6 W/(m2 K)

[A].	Re. 0.162 x	[B].	Re. 0.324 x
[C].	Re. 0.054 x	[D].	Re. 324 x

Answer: Option B

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