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 each edge of cube increased by 10 % , the percentage increase in
Options: a ) 21 , b ) 22 , c ) 25 , d ) 19 , e ) 15

Ex Output:
a

Ex Input:
Problem: what is the rate percent when the simple interest on rs . 800 amount to rs . 200 in 4 years ?
Options: a ) 5 % , b ) 7 % , c ) 6.25 % , d ) 2 % , e ) 4 %

Ex Output:
c

Ex Input:
Problem: at what rate percent per annum will the simple interest on a sum of money be 7 / 5 of the amount in 10 years ?
Options: a ) 4 % , b ) 7 % , c ) 9 % , d ) 3 % , e ) 14 %

Ex Output:
e