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: john had a stock of 1400 books in his bookshop . he sold 62 on monday , 62 on tuesday , 60 on wednesday , 48 on thursday and 40 on friday . what percentage of the books were not sold ?
Options: a ) 81.57 % , b ) 36.5 % , c ) 80.67 % , d ) 56.5 % , e ) 80.57 %
Example Output: e

Example Input: Problem: calculate the dividend from moses ' s stock , if he invested rs . 3000 at 72 to obtain an income of rs . 210 .
Options: a ) 3 , b ) 9 , c ) 3 , d ) 4 , e ) 5.04
Example Output: e

Example Input: Problem: walking 7 / 6 of his usual rate , a boy reaches his school 4 min early . find his usual time to reach the school ?
Options: a ) 11 , b ) 15 , c ) 16 , d ) 28 , e ) 19
Example Output:
d