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: an agent , gets a commission of 2.5 % on the sales of cloth . if on a certain day , he gets rs . 21 as commission , the cloth sold through him on that day is worth 
Options: a ) 333 , b ) 500 , c ) 840 , d ) 299 , e ) 132

Ex Output:
c


Ex Input:
Problem: a person buys an article at rs . 400 . at what price should he sell the article so as to make a profit of 40 % ? 
Options: a ) 600 , b ) 277 , c ) 560 , d ) 261 , e ) 281

Ex Output:
c


Ex Input:
Problem: the population of a town is 15000 . it decreases annually at the rate of 20 % p . a . what will be its population after 2 years ? 
Options: a ) 4300 , b ) 4500 , c ) 5120 , d ) 9600 , e ) 5366

Ex Output:

d