The floor of a rectangular hall has a perimeter 250 m. If the cost of painting the four walls at the rate of rs 10 per m2 is rs15000, find the height of the hall.
[Hint : Area of the four walls = Lateral surface area.]
Answer
Perimeter of rectangular hall = 2(l + b) = 250 m
Total cost of painting = ���15000
Rate per m2 = rs10
Area of four walls = 2(l + b) h m2 = (250×h) m2
A/q,
(250×h)×10 = rs15000
⇒ 2500×h = rs15000
⇒ h = 15000/2500 m
⇒ h = 6 m
Thus the height of the hall is 6 m.
