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: a can complete a certain job in 19 days . b is 90 % more efficient than a . in how many days can b complete the same job ? 
Options: a ) 6 , b ) 6.25 , c ) 7 , d ) 7.5 , e ) 10
Example Output: e

Example Input: Problem: by selling an article for $ 110 , a person gains $ 10 . what is the gain % ? 
Options: a ) 25 % , b ) 30 % , c ) 50 % , d ) 20 % , e ) 10 %
Example Output: e

Example Input: Problem: the sale price sarees listed for rs . 750 after successive discount is 20 % and 15 % is ? 
Options: a ) 227 , b ) 570 , c ) 342 , d ) 680 , e ) 230
Example Output:
b