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: if 45 % of z is 96 % of y and y is 75 % of x , what percent of x is z ? 
Options: a ) 200 , b ) 160 , c ) 100 , d ) 65 , e ) 50

Ex Output:
b


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: what percentage of numbers from 1 to 70 have 1 or 9 in the unit ' s digit ? 
Options: a ) 10 % , b ) 30 % , c ) 20 % , d ) 70 % , e ) 45 %

Ex Output:

c