Question

7. The length, breadth and height of a hall are
7 m. 5m and 4 m respectively. It has two
doors measuring 3 mx 2 m each and four
windows measuring 2 mx I m each. Find the
cost of white washing all the four walls and
the ceiling of the hall at the rate of 200
per m²​

Answer 1

Answer:

CSA of rectangle = 2h(l+b)

2×4(7+5) = 96 sqm

area of two doors = 2×3×2 = 12 sqm

area of 4 windows = 4×2×1 = 8 sqm

area rectangle — area of doors and windows= 76sqm

area of ceiling = 7×5 = 30 sqm

total area = 106sqm

cost of whitewashing per sqm = rs200

total cost = 200 × 106 = 21600

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