A door of length 4 m and breadth 3 m is fitted in the wall. The length of the wall is 15.4 m and width is
123 m. Find the remaining area of the wall. Also, find the cost of whitewashing the wall at the rate of 20
per m
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(this is the example of the answer so we can do like this)
Area be to white washed = area of the wall - area of the door
= l×b - l×b
= 15.4×123 - 4×3
= 1894.2 - 12
= 188.2
Cost of white washing 1m² = Rs 20
Cost of white washing 14.20m² = 188.2×20
= Rs 37644
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= Rs 37644
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