8. A door of dimensions 3 m x 2m is on the wall of dimension 10 m x 10 m. Find the cost of painting the wall if rate of painting is Rs 2.50 per sq. m.
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Answers
Answer:
Rs. 235
Step-by-step explanation:
Given that a door of dimensions 3m × 2m is on the wall of dimension 10m × 10m. We need to find out the cost of painting the wall if rate of painting is Rs 2.50 per sq. m.
We know that both door and room (or walls) are in rectangular shape. From this we can say that we need to find out the area of rectangle.
Area of rectangle = length × breadth
(where the length of the door is 3 m and breadth is 2 m. Similarly, length of the room is 10 m and it's breadth is 10 m. Since, both length and breadth are shape, that means wall is in the shape of square)
Area of square = side × side
Therefore,
Area of the door = 3 × 2 = 6 m² and area of the wall = 10 × 10 = 100 m²
Since, we need to find out thcost of painting the wall if rate of painting is Rs 2.50 per m². The questioner is not talking about the door. That means we need to exclude the area of door from the area of wall.
So,
Area of wall excluding area of door = (100 - 6)m² = 94 m²
Now,
The rate of cost of painting the wall of 1 m² area = Rs. 2.50 per m²
The rate of cost of painting at wall 94 m² = 2.50 × 94 = Rs. 235
Hence, the the cost of painting the wall if rate of painting is Rs 2.50 per m² is Rs. 235.
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