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'.

Example Input: Problem: an agent , gets a commission of 4 % on the sales of cloth . if on a certain day , he gets rs . 12.50 as commission , the cloth sold through him on that day is worth 
Options: a ) 312 , b ) 500 , c ) 887 , d ) 299 , e ) 132
Example Output: a

Example Input: Problem: a sum of money at simple interest amounts to rs . 815 in 3 years and to rs . 865 in 4 years . the sum is : 
Options: a ) s . 665 , b ) s . 690 , c ) s . 698 , d ) s . 700 , e ) s . 720
Example Output: a

Example Input: Problem: a restaurant spends one quarter of its monthly budget for rent and half of the rest for food and beverages . what percentage of the budget does the restaurant spend for food and beverages ? 
Options: a ) 23.5 % , b ) 32.5 % , c ) 35 % , d ) 37.5 % , e ) 75 %
Example Output:
d