A door of breadth 1m and height 2 m is fitted in a wall. The length of the wall is 4.5 m and the height is 3.6 m. Find the cost of white washing the wall, if the rate of white washing the wall is rupees 20 per m2.
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Answer:
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.
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