A classroom is 7 m long, 6 m broad and 3.5 m high. Doors and windows occupy an area of 17 m2. What is the cost of white washing the walls at the rate of Rs 1.50 per m2?
Given details are,
Dimensions of class room = 7m × 6m × 3.5m
Where, Length = 7m, Breadth = 6m, Height = 3.5m
Area of four walls (including doors & windows) = 2 (lh + bh) m2
= 2 (7×3.5 + 6×3.5)
= 91m2
Area of four walls (without doors & windows) =
Area including doors & windows – area occupied by doors & windows
= 91 – 17 = 74 m2
Then,
Cost for white washing 1m2 area of walls = Rs 1.50
∴ Total cost for white washing the walls = 74 × 1.50 = Rs 111
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