Question:
A roof of dimensions 6.5m x 5.5m is covered on all sides by a 1m high wall of width 30cm.The remaining part of the roof is covered with a waterproof covering a Rs 9 per sqm.Find the total cost of waterproofing?Â
Answer:
Given, the roof is covered by all sides.
There are total four sides which covered the roof and having dimensions 1 m 30 cm each.
Now area of all four walls = 4 * 1 * (30/100) m {simce 1 cm = 1/100 m}
= 120/100
= 1.2 m2
Now, cost of 1 m2 = Rs 9
So, the cost of 1.2 m2 = Rs 9 * 1.2 = Rs 10.8
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