An electric kettle used to prepare tea, takes 2 minutes to boil 4 cups of water (1 cup contains 200 cc of water) if the room temperature is 25°C. (a) If the cost of power consumption is Rs. 1.00 per unit (1 unit – 1000 watt-hour), calculate the coat of coiling 4 cups of water. (b) What will be the corresponding cost if the room temperature drops to 5°C?

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