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: if each edge of cube increased by 30 % , the percentage increase in 
Options: a ) 69 , b ) 72 , c ) 64 , d ) 61 , e ) 75
[A]: a


[Q]: Problem: the cost price of an article is 70 % of the marked price . calculate the gain percent after allowing a discount of 10 % . 
Options: a ) 13.6 % , b ) 28.6 % , c ) 35.6 % , d ) 42.3 % , e ) none
[A]: b


[Q]: Problem: solution y is 30 percent liquid x and 70 percent water . if 2 kilograms of water evaporate from 8 kilograms of solutions y and 2 kilograms of solution y are added to the remaining 6 kilograms of liquid , what percent of this new liquid solution is liquid x ? 
Options: a ) 30 % , b ) 33 1 / 3 % , c ) 37 1 / 2 % , d ) 40 % , e ) 50 %
[A]:
c