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 population of a town is 30000 . it decreases annually at the rate of 20 % p . a . what will be its population after 2 years ? 
Options: a ) 4300 , b ) 19200 , c ) 5120 , d ) 5230 , e ) 5366
[A]: b


[Q]: Problem: rs 50000 is divided into two parts one part is given to a person with 10 % interest and another part is given to a person with 20 % interest . at the end of first year he gets profit 8000 find money given by 10 % ? 
Options: a ) 20000 , b ) 40000 , c ) 50000 , d ) 60000 , e ) 70000
[A]: a


[Q]: Problem: at the moment there are 54210 tagged birds in a certain wildlife refuge . if exactly 30 percent of all birds in the refuge are tagged , what percent of the untagged birds must be tagged so that half of all birds in the refuge are tagged ? 
Options: a ) 66.67 , b ) 66 , c ) 67 , d ) 65.99 , e ) 67.26
[A]:
a