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: the market value of a certain machine decreased by 10 percent of its purchase price each year . if the machine was purchased in 1982 for its market value of $ 8000 , what was its market value two years later ? 
Options: a ) $ 8,000 , b ) $ 5,600 , c ) $ 3,200 , d ) $ 6,400 , e ) $ 800
Example Output: d

Example Input: Problem: ? % of 360 = 108.0 
Options: a ) 277 , b ) 36 , c ) 64 , d ) 72 , e ) 30
Example Output: e

Example Input: Problem: two numbers are respectively 35 % and 50 % more than a third number . the percentage that is first of the second is ? 
Options: a ) 90 % , b ) 47 % , c ) 38 % , d ) 52 % , e ) 83 %
Example Output:
a