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: what is the value of â ˆ š 25 % ? 
Options: a ) 10 % , b ) 50 % , c ) 25 % , d ) 45 % , e ) 68 %

A: b
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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
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Q: Problem: what quantity of water should taken out to concentrate 15 liters of 40 % acidic liquid to 60 % acidic liquid ? 
Options: a ) 5 liters , b ) 10 liters , c ) 15 liters , d ) 8 liters , e ) 6 liters

A:
a
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