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: the annual interest rate earned by an investment increased by 11 percent from last year to this year . if the annual interest rate earned by the investment this year was 22 percent , what was the annual interest rate last year ?
Options: a ) 17 % , b ) 19 % , c ) 18 % , d ) 20 % , e ) 22 %

Ex Output:
d

Ex Input:
Problem: on selling 17 balls at rs . 720 , there is a loss equal to the cost price of 5 balls . the cost price of a ball is
Options: a ) 20 , b ) 30 , c ) 40 , d ) 50 , e ) 60

Ex Output:
e

Ex Input:
Problem: the length of a rectangular floor is more than its breadth by 100 % . if rs . 600 is required to paint the floor at the rate of rs . 3 per sq m , then what would be the length of the floor ?
Options: a ) 15.0 m . , b ) 14.4 m . , c ) 12.0 m . , d ) 16.2 m . , e ) 16.5 m .

Ex Output:
b