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 fruit seller had some oranges . he sells 30 % oranges and still has 420 oranges . how many oranges he had originally ? 
Options: a ) 420 , b ) 600 , c ) 220 , d ) 400 , e ) none of these

Ex Output:
b


Ex Input:
Problem: mary works in a restaurant a maximum of 70 hours . for the first 20 hours , she is paid $ 8 per hour . for each overtime hour , she is paid at a rate which is 25 % higher than her regular rate . how much mary can earn in a week ? 
Options: a ) 600 , b ) 620 , c ) 660 , d ) 320 , e ) 400

Ex Output:
c


Ex Input:
Problem: the price of a shirt is increased by 15 % and then reduced by 15 % . the final price of the shirt is ? 
Options: a ) $ 97.75 , b ) $ 90 , c ) $ 91.56 , d ) $ 95.62 , e ) $ 93.45

Ex Output:

a