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: calculate how many seconds it will take for 4 bells to toll together again , given that they begin to toll together respectively at the intervals of 9 , 10 , 14 and 18 seconds . ? 
Options: a ) 636 , b ) 631 , c ) 633 , d ) 610 , e ) 630

Ex Output:
e


Ex Input:
Problem: find the compound interest on $ 800 for 1 year at 10 % p . a . if ci is component yearly ? 
Options: a ) $ 40 , b ) $ 400 , c ) $ 840 , d ) $ 800 , e ) $ 80

Ex Output:
a


Ex Input:
Problem: in town x , 64 percent of the population are employed , and 50 percent of the population are employed males . what percent of the employed people in town x are females ? 
Options: a ) 16 % , b ) 22 % , c ) 32 % , d ) 40 % , e ) 52 %

Ex Output:

b