The perimeter of the floor of a hall is 400 m. If the height is 6 m, find the cost of a painting the four walls at the rate of Rs. 10 per square metre.
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Answer:400=2ll+2b
200=l+b
area of four walls are 2bh+2lh
so in the above equation we can multiply both the side by h
200h=lh+bh
200X6=area of four walls
1200=area of walls
cost of painting the four walls are 10X1200
=$12000
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