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'.

Input: Consider Input: Problem: a sum was put at simple interest at a certain rate for 3 years . had it been put at 2 % higher rate , it would have fetched rs . 360 more . find the sum .
Options: a ) 3000 , b ) 6000 , c ) 2000 , d ) 4000 , e ) none of them

Output: b

Input: Consider Input: Problem: what is 120 % of 13 / 24 of 840 ?
Options: a ) 436 , b ) 478 , c ) 512 , d ) 546 , e ) 620

Output: d

Input: Consider Input: Problem: a merchant marks his goods up by 40 % and then offers a discount of 15 % on the marked price . what % profit does the merchant make after the discount ?
Options: a ) 21 % , b ) 25 % , c ) 69 % , d ) 31 % , e ) 19 %
Output: e