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: two numbers are respectively 50 % and 100 % more than a third number . the percentage that is first of the second is ?
Options: a ) 65 % , b ) 83 % , c ) 27 % , d ) 42 % , e ) 75 %

Ex Output:
e

Ex Input:
Problem: tickets to a certain concert sell for $ 20 each . the first 10 people to show up at the ticket booth received a 40 % discount , and the next 20 received a 15 % discount . if 50 people bought tickets to the concert , what was the total revenue from ticket sales ?
Options: a ) $ 600 , b ) $ 740 , c ) $ 860 , d ) $ 980 , e ) $ 1,140

Ex Output:
c

Ex Input:
Problem: a trader cheats both his supplier and customer by using faulty weights . when he buys from the supplier , he takes 10 % more than the indicated weight . when he sells to his customer , he gives the customer a weight such that 10 % of that is added to the weight , the weight claimed by the trader is obtained . if he charges the cost price of the weight that he claims , find his profit percentage .
Options: a ) 20 % , b ) 21 % , c ) 21.33 % , d ) 22.109 % , e ) 23 %

Ex Output:
b