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 28 % of a number exceeds 18 % of it by 7.2 , then find the number ? 
Options: a ) 50 , b ) 34 , c ) 55 , d ) 60 , e ) 90

Ex Output:
e


Ex Input:
Problem: a , b and c enter into partnership . a invests some money at the beginning , b invests double the amount after 6 months , and c invests thrice the amount after 8 months . if the annual gain be rs . 21000 . a ' s share is ? 
Options: a ) 2999 , b ) 2778 , c ) 7000 , d ) 2889 , e ) 6612

Ex Output:
c


Ex Input:
Problem: a person incurs 10 % loss by selling a watch for $ 100 . at what price should the watch be sold to earn 10 % profit ? 
Options: a ) $ 100 , b ) $ 122 , c ) $ 150 , d ) $ 210 , e ) $ 170

Ex Output:

b