Question : The internal length, breadth, and height of a cuboidal room are 12 m, 8 m, and 10 m, respectively. The total cost (in INR) of whitewashing only all four walls of the room at the cost of INR 25 per m2, is:
Option 1: 12,600
Option 2: 10,000
Option 3: 11,400
Option 4: 18,000
Correct Answer: 10,000
Solution :
Length = 12 m
Breadth = 8 m
Height = 10 m
Cost of 1 m$^2$ wall painting = INR 25
Formula used:
Area of four walls = 2(l + b) × h
Where,
Length = l
Breadth = b
Height = h
Calculation:
Area of four walls = 2(l + b) × h
= 2(12 + 8) × 10
= 2 × 20 × 10
= 400 m$^2$
Cost of 1 m$^2$ wall painting = INR 25
Cost of 400 m$^2$ wall painting = INR 25 × 400 = INR 10,000
$\therefore$ Total cost (in INR) of whitewashing only all four walls of the room is INR 10,000.
Hence, the correct answer is 10,000.
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