Find the cost of fencing around a circular field of diameter 22 m at the rate of Rs.2.50 a meter?	Choices:
A) 188
B) 172
C) 278
D) 279
E) 222

Rationale: "2 * 22 / 7 * 11 = 69 69 * 2 1 / 2 = rs . 172 answer : b"
Answer: B