by Oshi

(Dubai)

First, let us find the area of the ceiling. We get it by multiplying the length of the room by the breadth of the room:

4.5m x 3m = 13.5m^2

Next, let us find the area of the walls; we can add up the length and the breadth before multiplying by the height of the room, and then multiply by two to get the area of all four walls:

(4.5m + 3m) x 350cm

= 7.5m x 350cm

Now, it is crucial that we should convert all units to the same unit before we proceed to multiply, so:

7.5m x 350cm

= 7.5m x 3.5m

= 26.25m^2

Now, add up the areas of the walls with the area of the ceiling:

26.25m^2 + 13.5m^2

=39.75m^2

Lastly, we can now multiply the total area of the room by the cost of plastering:

39.75 x Rs8

=