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  3. The floor of a rectangular hall has a perimeter 250m . if the cost of painting the four walls at the rate of 10 per m^2 is Rs15000 . Find the height of the hall .
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The floor of a rectangular hall has a perimeter 250m . if the cost of painting the four walls at the rate of 10 per m^2 is Rs15000 . Find the height of the hall .

Answers (1)
D Deependra Verma

Solution :  Let the height of the hall be  h metres  . Then , 

Area of the four wall = perimeter of the floor  imes Height =(250 imes h)m^2=250h m^2

                 cost of painting of 1 square metre =Rs 10

herefore              cost of the painting of the four walls =Rs(250h imes 10)=Rs2500h

But, it is gives that the cost of painting  of four walls is Rs 15000. 

herefore             2500h=15000Rightarrow h=frac150002500=6

Hence , the height of the hall is 6m . 

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