The internal length, breadth and height of acuboid room are 12 m, 8 m and 10 m, respectively. The total cost ( in Rs) of whitewashing only all four walls of the rooms at the cost of Rs25 per m2 , is :
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 10,000.
We know that,
Area of four walls = 2(l + b) × h
Where,
Length = I, Breadth = b, and Height = h
Now,
Area of four walls = 2(l + b) × h
⇒ 2(12 + 8) × 10
⇒ 2 × 20 × 10 = 400 m2
Cost of 1 m2 wall painting = Rs. 25
Cost of 400 m2 wall painting = Rs. 25 × 400 = 10000
Thus,
The total cost (in Rs.) of whitewashing only all four walls of the room is Rs. 10000.