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: 90 percent of your marbles are a solid color . 5 percent of your marbles are solid yellow . what percentage of your marbles are a solid color other than yellow ? 
Options: a ) 5 , b ) 15 , c ) 85 , d ) 90 , e ) 95

Ex Output:
c


Ex Input:
Problem: a sum of money at simple interest amounts to $ 815 in 3 years and to $ 854 in 4 years . the sum is : 
Options: a ) $ 153 , b ) $ 698 , c ) $ 398 , d ) $ 549 , e ) $ 675

Ex Output:
b


Ex Input:
Problem: population is 20000 . pop increases by 10 % every year , then the pop after 3 years is ? 
Options: a ) 26630 , b ) 26640 , c ) 36620 , d ) 26620 , e ) 26820

Ex Output:

d