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in Areas Related To Circles by (28.9k points)
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A field is in the form of a circle. A fence is to be erected around the field. The cost of fencing would be Rs.2640 at the rate of Rs.12 per metre. Then, the field is to be thoroughly ploughed at the cost of Re.0.50 per m2. What is the amount required to plough the field?(use π = \(\frac{22}7\))

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Total cost of fencing = Rs 2640 

Per meter rate of fencing = Rs 12 

So, 

Circumference of field = \(\frac{2640}{12}\) = 220 m

r = \(\frac{220\times7}{2\times22}\) = 35

Radius of field = 35 m 

Area of field = \(\frac{22}7\times35\times35\) = 3850 m2 

Cost of plugging 1 m2 field = 0.50 Rs 

Total cost of plugging the field = 3850 × 0.50 

= Rs 1925.00

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