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: if 15 % of 40 is greater than 25 % of a number by 2 , the number is
Options: a ) 14 , b ) 16 , c ) 18 , d ) 20 , e ) 22

Ex Output:
b

Ex Input:
Problem: running at the same constant rate , 6 identical machines can produce a total of 270 bottles per minute . at this rate , how many bottles could 8 such machines produce in 4 minutes ?
Options: a ) 648 , b ) 1800 , c ) 2700 , d ) 1440 , e ) none of these

Ex Output:
d

Ex Input:
Problem: in how many years rs 100 will produce the same interest at 5 % as rs . 600 produce in 4 years at 10 %
Options: a ) 44 , b ) 52 , c ) 50 , d ) 46 , e ) 48

Ex Output:
e