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    Question

    The length, breadth and height of a room are 8m, 10m and

    12m respectively. Find the cost of white washing the room at the rate of Rs 15 per m²?
    A Rs. 8,310 Correct Answer Incorrect Answer
    B Rs. 6,720 Correct Answer Incorrect Answer
    C Rs. 9,270 Correct Answer Incorrect Answer
    D Rs. 7,680 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Area of walls = 2h (l + b) Length = 8m, breadth = 10m and height = 12m So, area of 4 walls = 2 × 12 (8 + 10)  = 24 × 18 = 432 m² Area of ceiling = l × b = 8 × 10 = 80 m² So total area for white wash = 432 + 80 = 512 m² Rate per square meter = Rs 15 Then,  Total cost = 512 × 15 = Rs. 7,680

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