The internal length, breadth and height of a cuboidal room are 12 m, 8 m and 10 m,respectively. The total cost (in ₹) of white washing only all four walls of the room at the cost of ₹25 per m2 is:
Answer & explanation
Correct answer: option 2
We know that,
Area of four walls = 2(l + b) × h
We have,
Length = 12 m
Breadth = 8 m
Height = 10 m
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 = 25 × 400 = 10000