The internal measure of a cuboidal room is with a length of 12 m, a breadth of 8 m, and a height of 10 m. The total cost(in Rs.) of whitewashing all four walls of the room and also the ceiling of the room, if the cost of the room, if the cost of whitewashing is Rs.25 per m2, is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 12,400.
We know that,
Lateral surface area = 2 × h × (l + b)
Area = l × b
where,
I = Length, b = Breadth, and h = Height
Calculation:
Area of walls = 2 × 10 × (12 + 8) = 20 × 20 = 400
Area of ceiling = 12 × 8 = 96
Total cost of whitewashing = 25 × (400 + 96) = 12400
Hence,
The total cost of whitewashing all four walls of the room and also the ceiling of the room is Rs.12400