A room is 10 m long 6m wide 4.2 m high. It has one door of 2.5×1.5 and one window of dimension 1.5×1 . Find the coast of whitewashing the walls at rupee 2.50 per sq.m. Whit steps
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Step by step explanation :
Length =10m
Breadth =6m
Height =4.2m
Area of door=2.5 x 1.5
=3.75m^2
Area of window =1.5 x 1
=1.5m^2
Lateral surface area of walls=2(l+b)h
=2 x (10+6) x 4.2
=2 x 16 x 4.2
=134.4m^2
Area of window + area of door
=1.5+3.75
=5.25m^2
Area of walls for white washing=134.4m^2 - 5.25m^2
=129.15m^2
Cost of white washing the walls=129.15 x 2.50
=₹322.875
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