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: jackie has two solutions that are 2 percent sulfuric acid and 12 percent sulfuric acid by volume , respectively . if these solutions are mixed in appropriate quantities to produce 60 liters of a solution that is 10 percent sulfuric acid , approximately how many liters of the 12 percent solution will be required ? 
Options: a ) 18 , b ) 20 , c ) 48 , d ) 36 , e ) 42
Example Output: c

Example Input: Problem: a , b and c started a business with capitals of rs . 8000 , rs . 10000 and rs . 12000 respectively . at the end of the year , the profit share of b is rs . 1700 . the difference between the profit shares of a and c is ? 
Options: a ) 288 , b ) 266 , c ) 155 , d ) 680 , e ) 441
Example Output: d

Example Input: Problem: find the annual income derived by investing $ 6800 in 20 % stock at 136 . 
Options: a ) 550 , b ) 1000 , c ) 2500 , d ) 300 , e ) 4000
Example Output:
b