What will be the cost of painting the four walls of a room if the rate of painting is Rs. 20 per square metre?
I. Perimeter of the floor is 52 m.
II. Height of the wall of the room is 15 m.
III. Ratio of length and breadth of the room is 5 : 2.
From I and II, Area of four walls = 2( l + b ) × h ⇒ 52 × 15 = 780 m² ∴ Cost of painting the four walls = 780 × 20 = Rs. 15,600
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