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'.

Ex Input:
Problem: a cycle is bought for rs . 900 and sold for rs . 1150 , find the gain percent ?
Options: a ) 15 , b ) 20 , c ) 27.77 , d ) 40 , e ) 12

Ex Output:
c

Ex 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

Ex Output:
b

Ex Input:
Problem: mahesh marks an article 15 % above the cost price of rs . 540 . what must be his discount percentage if he sells it at rs . 496.80 ?
Options: a ) 22 , b ) 27 , c ) 20 , d ) 21 , e ) 12

Ex Output:
c