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'.

[Q]: Problem: a number exceeds 20 % of itself by 40 . the number is ? 
Options: a ) 50 , b ) 60 , c ) 80 , d ) 320 , e ) none
[A]: a


[Q]: Problem: on a sum of money , the s . i . for 2 years is $ 600 , while the c . i . is $ 612 , the rate of interest being the same in both the cases . the rate of interest is ? 
Options: a ) 3 % , b ) 4 % , c ) 5 % , d ) 6 % , e ) 7 %
[A]: b


[Q]: Problem: two numbers are respectively 40 % and 60 % more than a third number . what percentage is the first of the second ? 
Options: a ) 72 % , b ) 87.5 % , c ) 63.7 % , d ) 56.9 % , e ) 90 %
[A]:
b