The length, breadth and height of a hall are 10 m, 20 m and 15m respectively. Find the cost of whitewashing the walls of the inside of the hall and ceiling at the rate of ₹10.20/m2
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Rs. 11220.
Area of the four walls = 2(l + b)h = 2(10 + 20)15 = 2 × 30 × 15 = 900 m2
Area of the ceiling = lb = 10 × 20 = 200 m2
Total area = 900 + 200 = 1100 m2
Total cost = 1100 × 10.20 = 11220
The cost of whitewashing the walls and ceiling of the hall is Rs.11220.