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: two numbers are respectively 50 % and 100 % more than a third number . the percentage that is first of the second is ? 
Options: a ) 65 % , b ) 83 % , c ) 27 % , d ) 42 % , e ) 75 %
Example Output: e

Example Input: Problem: a fruit seller had some oranges . he sells 30 % oranges and still has 420 oranges . how many oranges he had originally ? 
Options: a ) 420 , b ) 600 , c ) 220 , d ) 400 , e ) none of these
Example Output: b

Example Input: Problem: a fruit seller had some oranges . he sells 40 % oranges and still has 600 oranges . how many oranges he had originally ? 
Options: a ) 700 , b ) 710 , c ) 1000 , d ) 730 , e ) 740
Example Output:
c