Find the area of the four walls of a cubical room whose side measures 5m. Find the cost of white washing the room at the rate of '23 per square metre.

We know that one wall side is 5m.

To find the area of one wall, we do 5²=25m²

We know there is 4 walls. So we have to find total area of all four walls.

Which is 25*4=100m²

To find the total cost of white washing the room, we have to do:

100 (total area) * 23 (cost per m²) = $2300

So the total cost of the area is $2300