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 true discount on a bill of rs . 2460 is rs . 360 . what is the banker ' s discount ? 
Options: a ) rs . 432 , b ) rs . 422 , c ) rs . 412 , d ) rs . 442 , e ) none of these
Example Output: b

Example Input: Problem: a sum of $ 1000 amounts to $ 1500 in 5 years at simple interest . if the interest rate is increased by 5 % it would amount to how much ? 
Options: a ) $ 1000 , b ) $ 750 , c ) $ 1541 , d ) $ 1478 , e ) $ 1750
Example Output: e

Example Input: Problem: by investing in 1623 % stock at 64 , one earns rs . 1500 . the investment made is 
Options: a ) rs . 9600 , b ) rs . 7500 , c ) rs . 5640 , d ) rs . 5760 , e ) rs . 6760
Example Output:
d