A room is 6m long,5m broad and 4m high.there is a door 3m by 1m and two windows of size 1.5m by 1m.find the cost of plastering the walls at rs. 8 per m square.
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Length of room- 6m= L
Breadth of room- 5m= B
Height of room- 4m= H
Dimensions of the door= 3m*1m
Therefore area of the door= 3m^2
Dimensions of the windows= 1.5m*1m
Area of the windows= 2(1.5*1) [as there are two windows]
=3m^2
Area of 4 walls= 2(l+b)*h
Area of 4 walls= Lateral surface area (L.S.A)= 2(6+5)*4
L.S.A= 2*11*4
L.S.A= 88m^2
Area of 4 walls to be plastered= (L.S.A)-(Area of door+Area of two windows)
=88-(3+3)
=82m^2
Rate of plastering= Rs. 8 per square metre
Rate of plastering walls= 82×8
= Rs. 656
Breadth of room- 5m= B
Height of room- 4m= H
Dimensions of the door= 3m*1m
Therefore area of the door= 3m^2
Dimensions of the windows= 1.5m*1m
Area of the windows= 2(1.5*1) [as there are two windows]
=3m^2
Area of 4 walls= 2(l+b)*h
Area of 4 walls= Lateral surface area (L.S.A)= 2(6+5)*4
L.S.A= 2*11*4
L.S.A= 88m^2
Area of 4 walls to be plastered= (L.S.A)-(Area of door+Area of two windows)
=88-(3+3)
=82m^2
Rate of plastering= Rs. 8 per square metre
Rate of plastering walls= 82×8
= Rs. 656
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