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: how is 4 % expressed as a decimal fraction ? 
Options: a ) 0.4 , b ) 0.04 , c ) 0.004 , d ) 0.0004 , e ) 4

Ex Output:
b


Ex Input:
Problem: if the difference between compound interest ( interest compounded yearly ) and simple interest on a sum for 3 years at 20 % p . a . is rs . 132 , then the sum is 
Options: a ) rs . 3500 , b ) rs . 1500 , c ) rs . 2500 , d ) rs . 3000 , e ) none

Ex Output:
e


Ex Input:
Problem: population is 25000 . population increases by 10 % every year , then the population after 3 years is ? 
Options: a ) 26630 , b ) 33275 , c ) 36625 , d ) 26625 , e ) 26825

Ex Output:

b