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: what is the rate percent when the simple interest on rs . 800 amount to rs . 200 in 4 years ? 
Options: a ) 5 % , b ) 7 % , c ) 6.25 % , d ) 2 % , e ) 4 %
Example Output: c

Example Input: Problem: what is the value of â ˆ š 81 % ? 
Options: a ) 25 % , b ) 36 % , c ) 42 % , d ) 60 % , e ) 90 %
Example Output: e

Example Input: Problem: the balance of a trader weighs 10 % less than it should . still the trader marks up his goods to get an overall profit of 20 % . what is the mark up on the cost price ? 
Options: a ) 40 % , b ) 8 % , c ) 25 % , d ) 16.66 % , e ) 9 %
Example Output:
b