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: shop offered 20 % offer for every shirt , smith bought a shirt at rs . 780 . and what was the shop ' s original selling price ? 
Options: a ) 500 , b ) 550 , c ) 600 , d ) 700 , e ) 975

Ex Output:
e


Ex Input:
Problem: by selling 16 pencils for a rupee a man loses 28 % . how many for a rupee should he sell in order to gain 28 % ? 
Options: a ) 8 , b ) 9 , c ) 7 , d ) 6 , e ) 4

Ex Output:
b


Ex Input:
Problem: on a saturday night , each of the rooms at a certain motel was rented for either $ 40 or $ 60 . if 10 of the rooms that were rented for $ 60 had instead been rented for $ 40 , then the total rent the motel charged for that night would have been reduced by 40 percent . what was the total rent the motel actually charged for that night ? 
Options: a ) $ 500 , b ) $ 800 , c ) $ 1,000 , d ) $ 1,600 , e ) $ 2,400

Ex Output:

a