A classroom is 7m long, 6.5m wide & 4m high. It has one door & the dimension is 3m & 1.4m & 3 windows, each 2m & 1m. The interior walls are to be colour washed. The contractor charges rs 10.25 per m². Find the cost of colour washing.
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Dimensions of the room: length-7m, width-6.5m, height-4m.
Area of four walls=[2h(l+b)]
=[2x4(7+6.5)]
=(8x13. 5)
=108m sq.
area of one window =3mx1. 42
=4.2m sq.
area of three windows =3(2mx1m)
=6m sq.
total area of windows =(4.2+6)m sq.
=10.2m sq.
Area for whitewashing =(108-10.2)m sq.
=97.8m sq.
cost of 1 m sq. white washing = 3.50rupee
cost of 97.8m sq. white washing=10.25x 97.8 = 1002.45 rupees
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