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: 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: reena took a loan of $ . 1200 with simple interest for as many years as the rate of interest . if she paid $ 588 as interest at the end of the loan period , what was the rate of interest ? 
Options: a ) 3.6 , b ) 7 , c ) 18 , d ) can not be determined , e ) none of these

Ex Output:
b


Ex Input:
Problem: at a special sale , 12 tickets can be purchased for the price of 3 tickets . if 12 tickets are purchased at the sale , the amount saved will be what percent of the original price of the 12 tickets ? 
Options: a ) 20 % , b ) 33.3 % , c ) 40 % , d ) 50 % , e ) 75 %

Ex Output:

e