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: the profits of qrs company rose 10 % from march to april , then dropped 20 % from april to may , then rose 50 % from may to june . what was the percent increase for the whole quarter , from march to june ? 
Options: a ) 15 % , b ) 32 % , c ) 40 % , d ) 62 % , e ) 80 %
[A]: b


[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: walking 3 / 2 of his usual rate , a boy reaches his school 4 min early . find his usual time to reach the school ? 
Options: a ) 12 , b ) 99 , c ) 27 , d ) 28 , e ) 20
[A]:
a