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 sum of money at simple interest amounts to $ 815 in 3 years and to $ 854 in 4 years . the sum is : 
Options: a ) $ 153 , b ) $ 698 , c ) $ 398 , d ) $ 549 , e ) $ 675
[A]: b


[Q]: Problem: sonika bought a v . c . r . at the list price of 18,900 . if the rate of sales tax was 8 % , find the amount she had to pay for purchasing the v . c . r . 
Options: a ) 20,412 , b ) 19,780 , c ) 19,680 , d ) 19,380 , e ) none of these
[A]: a


[Q]: Problem: john makes $ 60 a week from his job . he earns a raise and now makes $ 90 a week . what is the % increase ? 
Options: a ) 16 % , b ) 50 % , c ) 17 % , d ) 17.61 % , e ) 17.56 %
[A]:
b