# Q : 3        The floor of a rectangular hall has a perimeter . If the cost of painting the four walls at the rate of Rs 10 per  is Rs 15000, find the height of the hall.               [Hint : Area of the four walls Lateral surface area.]

Given,

Perimeter of rectangular hall =

Cost of painting the four walls at the rate of Rs 10 per  = Rs 15000

Let the height of the wall be

Area to be painted =

Required cost =

Therefore, the height of the hall is

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