the dimension of a classroom are 12m 6m and 4m. find the cost of decorating the wall by a wallpaper of 50cm width,which costs Rs 30 per metre
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C.S.A of cuboid =2h(b+l)
=2*4(12+6)
=144m^2
Area of wallpaper=0.5m
=144/0.5 *30
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