In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Ex Input:
Problem: 2525 * 9 
Options: a ) 22725 , b ) 25675 , c ) 22655 , d ) 27575 , e ) none of these

Ex Output:
a


Ex Input:
Problem: find the value of 80641 x 9999 = m ? 
Options: a ) 807518799 , b ) 806436469 , c ) 807538799 , d ) 806329359 , e ) 817431046

Ex Output:
d


Ex Input:
Problem: if 20 liters of chemical x are added to 80 liters of a mixture that is 15 % chemical x and 85 % chemical y , then what percentage of the resulting mixture is chemical x ? 
Options: a ) 30 % , b ) 32 % , c ) 35 % , d ) 38 % , e ) 40 %

Ex Output:

b