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Area of rectangular door=length×breadth=2m×1m=2m
2
Area of wall including door=length×breadth=4.5m×3.6m=16.2m
2
Now, Area of wall excluding door
=Area of wall including door−Area of door
=16.2−2=14.2m
2
Since, The rate of white washing of 1m
2
the wall=Rs. 20
Therefore, the rate of white washing of 14.2m
2
the wall=20×14.2
=Rs. 284
Thus, the cost of white washing the wall excluding the door is Rs. 284.
Length of the door = 2m
Breadth of the door = 1.5m
Area of the door = A = l × b
Area of the door = 2 × 1.5m²
Area of the door = 3m²
Length of wall = 4.5m
Breadth of the wall = 3.6m
Area of the wall = A = l × b
Area of the wall = 4.5 × 3.6m²
Area of the wall = 16.20m²
Area of the wall excluding door = Area of wall - Area of door.
= 16.20m² - 3m²
= 13.20m²
= 13.20 × 20
= ₹264