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.]
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