The area of a circular field is 13.86 hectares . The cost

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The area of a circular field is 13.86 hectares . The cost of fencing it at the rate of 20 paisa per meter is ?

1. Rs. 277.20
2. Rs. 264
3. Rs. 324
4. Rs. 198

Correct Option: B

∵ 22/7 x r² = 13.86 x 10000
⇒ r² = (13.86 x 10000 x 7) / 22
∴ r = 210 m

⇒ Circumference = [2 x (22/7) x 210 ] m
= 1320 m

Cost of fencing = Rs. (1320 x 20)/100
= Rs . 264