If the cost of a 12 m x 7.5 m wall is Rs 21600, then
find the cost per square meter.
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Step-by-step explanation:
Total surface area of the room=2(lh+lb+hb)m
2
=2[9×6.5+9×8+8×6.5]m
2
=365m
2
Area of the door =l×b=2×1.5=3m
2
Area of the windows=l×b=1.5×1=1.5m
2
∴ Surface area of walls=TSA of room −Area of door−Area of windows
=365−3−1.5=360.5m
2
Cost of whitewashing per square meter=Rs. 6.40
∴ Cost of whitewashing the walls=Rs. 6.40×360.5
=Rs. 2307.2.
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