The cost of levelling a circular field at 50 Paise per square metre is Rs 7700. The cost (in Rs) of putting up a fence all round it at Rs 1.20 per meter is (Use π = 22/7)
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. Rs. 528
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Understanding |
Application |
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The cost of levelling a circular field at 50 Paise per square metre is Rs 7700. |
We know: Area of circle = πr2 So, (Area of circular field) × (Cost per square metre) = 7700 22/7 × r2 × 0.5 = 7700 ⇒ r2 = 4900 ⇒ r = 70 |
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Perimeter of circle = 2πr |
So, Cost of fencing all around the field = 2 × 22/7 × 70 × 1.2 = Rs. 528 |