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 article is bought for rs . 560 and sold for rs . 340 , find the loss percent ? 
Options: a ) 36 % , b ) 38 % , c ) 16 % , d ) 39 % , e ) 12 %
Example Output: d

Example Input: Problem: a company recently conducted a survey and found that 25,000 of its customers live in rural areas . if the number of customers who live in urban areas is 120 percent greater than the number of customers who live in rural areas , how many customers live in urban areas ? 
Options: a ) 50,000 , b ) 55,000 , c ) 60,000 , d ) 65,000 , e ) 70,000
Example Output: b

Example Input: Problem: what is the compound interest on rs . 6500 at 5.5 % p . a . compounded half - yearly for 1 year . 
Options: a ) 369.42 , b ) 762.42 , c ) 162.42 , d ) 362.42 , e ) 333.42
Example Output:
d