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A door of length 5m and breadth 4m is fitted in a wall. the length of the wall is 20m and the breadth is 15m. find the cost of white washing the wall, if the rate of white washing the wall is ₹10 per sq m |
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Answer» Answer: AREA of RECTANGULAR door=length×breadth=2m×1m=2m2 Area of wall INCLUDING door=length×breadth=4.5m×3.6m=16.2m2 Now, Area of wall excluding door =Area of wall including door−Area of door =16.2−2=14.2m2 Since, The rate of white washing of 1m2 the wall=Rs. 20 Therefore, the rate of white washing of 14.2m2 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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