Find the cost of fencing around a circular field of diameter 20 m at the rate of Rs.1.50 a meter? Choose the correct choice from the following options.
A) 287
B) 94.2
C) 156
D) 158
E) 267

Rationale: "2 * 22 / 7 * 10 = 62.8 62.8 * 1 1 / 2 = rs . 94.2 answer : b"
Answer: B