The floor of a rectangular hall has a perimeter 250 m. If the cost of painting the four walls at the rate of ₹ 10 per sq m is ₹15000, then find the height of the hall?

8 m
6 m
9 m
7 m

Correct Answer: 6 m

Explanation:

Area of 4 wails = Lateral surface area perimeter = 2(l + b) = 250
⇒ l + b = 250/2 = 125 m
Area to be painted = Cost/Rate = 15000/10 = 1500 sq m
Area of 4 wails = 2(l + b)h = 250 h
⇒ 250h = 1500
∴ h = 1500/250 = 6 m

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