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: on a certain transatlantic crossing , 20 percent of a ship ' s passengers held round - trip tickets and also took their cars abroad the ship . if 50 percent of the passengers with round - trip tickets did not take their cars abroad the ship , what percent of the ship ' s passengers held round - trip tickets ? 
Options: a ) 33.3 % , b ) 40 % , c ) 50 % , d ) 60 % , e ) 66.6 %

Ex Output:
b


Ex Input:
Problem: the salaries of a and b together amount to $ 2000 . a spends 95 % of his salary and b , 85 % of his . if now , their savings are the same , what is a ' s salary ? 
Options: a ) $ 1000 , b ) $ 1250 , c ) $ 2500 , d ) $ 1500 , e ) $ 1200

Ex Output:
d


Ex Input:
Problem: an escalator moves towards the top level at the rate of 8 ft . sec and its length is 160 feet . if a person walks on the moving escalator at the rate of 2 feet per second towards the top level , how much time does he take to cover the entire length . 
Options: a ) 14 sec , b ) 10 sec , c ) 16 sec , d ) 8 sec , e ) 9 sec

Ex Output:

c