6. Find the cost of painting the room

The length, breadth and height of a room is 21 \(m\), 21 \(m\), and 18 \(m\). Find the cost of painting the walls and the ceiling at the rate of \(₹19\) per \(m^2\).

 

[Hint: Area of four walls \(=\) Lateral surface area]

 

Cost of painting the room \(=\) \(₹\)