In this task, you need to answer the given multiple-choice question on the gain. Gain is the value by which to multiply the input. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Ex Input:
Problem: the c . p of 20 books is equal to the s . p of 30 books . find his gain % or loss % ? 
Options: a ) 63.33 % , b ) 34.33 % , c ) 33.33 % , d ) 31.33 % , e ) 36.33 %

Ex Output:
c


Ex Input:
Problem: a , b and c invested rs . 6300 , rs . 4200 and rs . 10500 respectively , in a partnership business . find the share of a in profit of rs . 12600 after a year ? 
Options: a ) 3630 , b ) 3637 , c ) 3630 , d ) 3631 , e ) 3780

Ex Output:
e


Ex Input:
Problem: the present population of a town is 3744 . population increase rate is 20 % p . a . find the population of town before 2 years ? 
Options: a ) 2500 , b ) 2600 , c ) 3500 , d ) 3600 , e ) 2050

Ex Output:

b