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'.

Example Input: Problem: if the cost price of 50 articles is equal to the selling price of 20 articles , then the gain or loss percent is ? 
Options: a ) 16 , b ) 127 , c ) 12 , d ) 18 , e ) 150
Example Output: e

Example Input: Problem: there were two candidates in an election . winner candidate received 58 % of votes and won the election by 288 votes . find the number of votes casted to the winning candidate ? 
Options: a ) 776 , b ) 1044 , c ) 299 , d ) 257 , e ) 125
Example Output: b

Example Input: Problem: what annual installment will discharge a debt of rs . 1260 due in 3 years at 12 % simple interest ? 
Options: a ) 315 , b ) 345 , c ) 325 , d ) 375 , e ) none of them
Example Output:
d