In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[EX Q]: Problem: an seller earns an income of re 1 on the first day of his business . on every subsequent day , he earns an income which is just thrice of that made on the previous day . on the 20 th day of business , he earns an income of :
Options: a ) 29 , b ) 57 , c ) 35 , d ) 20 , e ) 30
[EX A]: b

[EX Q]: Problem: x can finish a work in 25 days . y can finish the same work in 20 days . y worked for 12 days and left the job . how many days does x alone need to finish the remaining work ?
Options: a ) 2 , b ) 5 , c ) 6 , d ) 7 , e ) 8
[EX A]: e

[EX Q]: Problem: find the cost of fencing around a circular field of diameter 22 m at the rate of rs . 2.50 a meter ?
Options: a ) 188 , b ) 172 , c ) 278 , d ) 279 , e ) 222
[EX A]:
b