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: solution p is 20 percent lemonade and 80 percent carbonated water by volume ; solution q is 45 percent lemonade and 55 percent carbonated water by volume . if a mixture of pq contains 65 percent carbonated water , what percent of the volume of the mixture is p ? 
Options: a ) 20 % , b ) 40 % , c ) 50 % , d ) 60 % , e ) 80 %
[A]: b


[Q]: Problem: ramesh purchased a refrigerator for rs . 12500 after getting a discount of 20 % on the labelled price . he spent rs . 125 on transport and rs . 250 on installation . at what price should it be sold so that the profit earned would be 20 % if no discount was offered ? 
Options: a ) 19200 , b ) 17606 , c ) 17604 , d ) 17600 , e ) 117601
[A]: a


[Q]: Problem: a man buy a book in rs 50 & sale it rs 70 . what is the rate of profit ? ? ? 
Options: a ) 10 % , b ) 40 % , c ) 30 % , d ) 25 % , e ) 28 %
[A]:
b