If the perimeter of a room is 28m and its height is 2.5m. Then the cost of white washing its wall at the rate of 5 per square metre is
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Answer:
The total cost of white-washing its four walls is Rs.350
Step-by-step explanation:
Let a, b, c and d be the lengths of the sides of the room. Let h be the height of the walls. (Height will be common to all four walls!)
The sum of the areas of the four walls will be:
a*h + b*h + c*h + d*h
= (a+b+c+d)*h
= Perimeter * Height
Area of four walls in the given problem is:
28 * 2.5
= 70 sqm
Cost of white-washing is Rs.5 per sqm
Total cost of white-washing = 70 * 5
= 350
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