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: 12.1212 + 17.0005 - 9.1103 = ? 
Options: a ) 20.0015 , b ) 20.0105 , c ) 20.0115 , d ) 20.0114 , e ) none

Ex Output:
d


Ex Input:
Problem: the average marks of a class of 30 students is 40 and that of another class of 50 students is 60 . find the average marks of all the students ? 
Options: a ) 82.5 , b ) 52.9 , c ) 52.2 , d ) 52.5 , e ) 52.7

Ex Output:
d


Ex Input:
Problem: reeya obtained 40 , 60 , 70 , 80 and 80 out of 100 in different subjects , what will be the average 
Options: a ) 66 , b ) 75 , c ) 80 , d ) 85 , e ) 90

Ex Output:

a