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 total of $ 20,000 was invested in two certificates of deposit at simple annual interest rates of 6 percent and 8 percent , respectively . if the total interest on the two certificates was $ 1,440 at the end of one year , what fractional part of the $ 20.000 was invested at the higher rate ? 
Options: a ) 3 / 8 , b ) 2 / 5 , c ) 1 / 2 , d ) 3 / 5 , e ) 3 / 4
[A]: d


[Q]: Problem: the population of a town is 10000 . it increases annually at the rate of 27 % p . a . what will be its population after 2 years ? 
Options: a ) 14000 , b ) 14400 , c ) 16129 , d ) 14600 , e ) 14700
[A]: c


[Q]: Problem: i bought two books ; for rs . 450 . i sold one at a loss of 15 % and other at a gain of 19 % and then i found each book was sold at the same price . find the cost of the book sold at a loss ? 
Options: a ) 337 , b ) 262.5 , c ) 299.5 , d ) 266.5 , e ) 299
[A]:
b