Question

the walls of the roof of a room 10ft in length, 8ft in width and 10ft in height is to be painted. How much will it cost at ₹5 per square ft ?​

Answer 1

Answer:

Rs 2200

Step-by-step explanation:

Lateral surface area of the room (area of the walls) = 2×h (l+b)

= 2×10 (10+8) = 20×18 = 360 ft²

Surface area of the roof = l×b = 10×8 = 80 ft²

So, Surface area of room to be painted (walls and roof) = 360+80 = 440 ft²

Hence, cost of painting at Rs 5 per ft² = 440×5 = Rs 2200

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