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: at an election 2 candidates are participated and a candidate got 45 % of votes and defeated by 9000 . and 83 votes are invalid . find the total polled votes ? 
Options: a ) 84512 , b ) 78452 , c ) 65893 , d ) 90083 , e ) 74502
Example Output: d

Example Input: Problem: after decreasing 40 % in the price of an article costs rs . 1050 . find the actual cost of an article ? 
Options: a ) 1200 , b ) 1750 , c ) 1050 , d ) 1570 , e ) 1005
Example Output: b

Example Input: Problem: by selling a book for 200 , 20 % profit was earned . what is the cost price of the book ? 
Options: a ) a ) 215 , b ) b ) 166 , c ) c ) 230 , d ) d ) 235 , e ) e ) 240
Example Output:
b