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: 33 1 / 3 % of 360 ? 
Options: a ) 80 , b ) 90 , c ) 110 , d ) 120 , e ) 130
Example Output: d

Example Input: Problem: rs . 200 amounts to rs . 800 in 8 years at simple interest . if the interest is increased by 5 % , it would amount to how much ? 
Options: a ) 520 , b ) 440 , c ) 260 , d ) 280 , e ) 120
Example Output: d

Example Input: Problem: 4 is what percent of 50 ? 
Options: a ) 0.2 % , b ) 8 % , c ) 10 % , d ) 20 % , e ) 500 %
Example Output:
b