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 true discount on a bill due 9 months hence at 16 % per annum is rs . 150 . the amount of the bill is 
Options: a ) 1200 , b ) 1764 , c ) 1400 , d ) 1354 , e ) none of these

Ex Output:
c


Ex Input:
Problem: mahesh marks an article 15 % above the cost price of rs . 540 . what must be his discount percentage if he sells it at rs . 460 ? 
Options: a ) 18 % , b ) 21 % , c ) 25.9 % , d ) 19 % , e ) none of these

Ex Output:
c


Ex Input:
Problem: how many litres of pure acid are there in 12 litres of a 40 % solution 
Options: a ) 3.6 , b ) 4.8 , c ) 3.5 , d ) 2.3 , e ) 4.4

Ex Output:

b