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 area of a circle is increased by 1500 % . by what percent has the radius of the circle increased ? 
Options: a ) 100 % , b ) 200 % , c ) 300 % , d ) 600 % , e ) 800 %

Ex Output:
c


Ex Input:
Problem: a $ 500 investment and a $ 1,500 investment have a combined yearly return of 16 percent of the total of the two investments . if the $ 500 investment has a yearly return of 7 percent , what percent yearly return does the $ 1,500 investment have ? 
Options: a ) 9 % , b ) 10 % , c ) 105 / 8 % , d ) 11 % , e ) 19 %

Ex Output:
e


Ex Input:
Problem: an error 4 % in excess is made while measuring the side of a square . the percentage of error in the calculated area of the square is 
Options: a ) 8.04 % , b ) 8.14 % , c ) 8.23 % , d ) 8.16 % , e ) 8.5 %

Ex Output:

d