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'.

Input: Consider Input: Problem: how many liters of water must be evaporated from 50 liters of a 2 - percent sugar solution to get a 10 - percent solution ? 
Options: a ) 25 , b ) 30 , c ) 35 , d ) 40 , e ) 45

Output: d


Input: Consider Input: Problem: a sum fetched a total simple interest of 4034.25 at the rate of 9 % . p . a . in 5 years . what is the sum ? 
Options: a ) 5768 , b ) 8925 , c ) 8965 , d ) 6474 , e ) 8723

Output: c


Input: Consider Input: Problem: in 2008 , the profits of company n were 8 percent of revenues . in 2009 , the revenues of company n fell by 20 percent , but profits were 15 percent of revenues . the profits in 2009 were what percent of the profits in 2008 ? 
Options: a ) 150 % , b ) 105 % , c ) 120 % , d ) 124.2 % , e ) 138 %


Output: a