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: in an acoustics class , 120 students are male and 100 students are female . 25 % of the male students and 20 % of the female students are engineering students . 20 % of the male engineering students and 25 % of the female engineering students passed the final exam . what percentage of engineering students passed the exam ?
Options: a ) 5 % , b ) 10 % , c ) 16 % , d ) 22 % , e ) none of these
Example Output: d

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: the sale price sarees listed for rs . 495 after successive discount is 15 % and 10 % is ?
Options: a ) 288 , b ) 378 , c ) 342 , d ) 662 , e ) 262
Example Output:
b