Question : The length, breadth, and height of a hall are 10 m, 20 m, and 15 m, respectively. Find the cost of whitewashing the walls of the inside of the hall and ceiling, at the rate of INR 10.20 per m2.
Option 1: INR 13,394
Option 2: INR 11,220
Option 3: INR 15,320
Option 4: INR 16,542
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Correct Answer: INR 11,220
Solution : Given: The length, breadth, and height of a hall are 10 m, 20 m, and 15 m, respectively. The total area of the four walls of the hall = 2 × height (length + breadth) = 2 × 15 (10 + 20) m 2 = 30 × 30 = 900 m 2 The area of the ceiling = length × breadth = 10 × 20 = 200 m 2 So, the total area to be whitewashed = 900 + 200 = 1100 m 2 $\therefore$ The cost of painting the hall's walls and ceiling = 1100 × 10.20 = 11,220 Hence, the correct answer is INR 11,220.
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