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'.

Ex Input:
Problem: a reduction of 50 % in the price of apples would enable a man to obtain 50 more for rs . 50 , what is reduced price per dozen ? 
Options: a ) 1 , b ) 3 , c ) 6 , d ) 7 , e ) 10

Ex Output:
c


Ex Input:
Problem: a started a business with an investment of rs . 70000 and after 6 months b joined him investing rs . 120000 . if the profit at the end of a year is rs . 13000 , then the share of b is ? 
Options: a ) 6000 , b ) 12000 , c ) 18000 , d ) 24009 , e ) 24002

Ex Output:
a


Ex Input:
Problem: a tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume . if 4,000 gallons of water evaporate from the tank , the remaining solution will be approximately what percent sodium chloride ? 
Options: a ) 6.85 % , b ) 7.25 % , c ) 7.76 % , d ) 8.33 % , e ) 8.75 %

Ex Output:

d