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 40 % of a certain number is 160 , then what is 90 % of that number ? 
Options: a ) 270 , b ) 380 , c ) 260 , d ) 360 , e ) 290

Ex Output:
d


Ex Input:
Problem: a money lender lent rs . 1000 at 4 % per year and rs . 1400 at 5 % per year . the amount should be returned to him when the total interest comes to rs . 350 . find the number of years . 
Options: a ) 3.2 , b ) 3.75 , c ) 4 , d ) 4.25 , e ) 4.5

Ex Output:
a


Ex Input:
Problem: a hostel had provisions for 250 men for 44 days . if 50 men left the hostel , how long will the food last at the same rate ? 
Options: a ) 55 , b ) 40 , c ) 50 , d ) 60 , e ) 65

Ex Output:

a