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Total Surface Area of a Cuboid

A room is in ...

Question

A room is in the shape of a cuboid having length, breadth and height 6 m, 4 m and 3 m respectively. The cost of painting the four walls at the rate of ₹100 per $m^{2}$ is

₹4500

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₹8000

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₹5000

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₹6000

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Solution

The correct option is D ₹6000
Given that the length (l), breadth (b) and height (h) of the cuboid is 6 m, 4 m and 3 m, respectively.
Area of four walls = 2(l + b)h
= 2(lh + bh)
= 2(6 × 3 + 4 × 3)
$= 2 (18 + 12) = 60 m^{2}$
∴ Cost of painting four walls = ₹100 × 60 = ₹6000
Hence, the correct answer is option (d).

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A room is in the shape of a cuboid having length, breadth and height 6 m, 4 m and 3 m respectively. The cost of painting the four walls at the rate of ₹100 per m2 is

A room is in the shape of a cuboid having length, breadth and height 6 m, 4 m and 3 m respectively. The cost of painting the four walls at the rate of ₹100 per $m^{2}$ is