Question

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Answer 1

Answer:

₹555

Step-by-step explanation:

Lateral surface area of a cuboid:

If out of the 6 faces of a cuboid we do not include the bottom and top faces then the area of remaining four faces is called the lateral surface area of cuboid .

Area of four walls of a room= lateral surface area of a cuboid= 2(l+b)h

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Given , Dimensions of room are

length of the room(l) = 5m

breadth of the room(b) = 4m

height of the room(h) = 3m

Required area for white washing=Area of four walls + Area of ceiling = 2(l+b)×h + (l×b)

= 2(5+4)×3 + (5×4)

= 2×9×3 + 20

=(54 + 20)

= 74 m²

Cost of white washing = ₹7.50 per m²

Total cost of white washing= ₹ (74×7.50) = ₹ 555

Hence, the cost of white washing the walls of the room and the ceiling= ₹555.

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Hope this will help you....

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