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: the difference between compound interest and simple interest on a certain amount of money at 5 % per annum for 2 years is 17 . find the sum : 
Options: a ) 4500 , b ) 7500 , c ) 5000 , d ) 6800 , e ) none of these

Ex Output:
d


Ex Input:
Problem: a shopkeeper sells 300 metres of cloth for rs . 18000 at a loss of rs . 5 per metre . find his cost price for one metre of cloth ? 
Options: a ) 12 , b ) 27 , c ) 29 , d ) 50 , e ) 65

Ex Output:
e


Ex Input:
Problem: how many litres of pure acid are there in 5 litres of a 30 % solution 
Options: a ) 1.5 , b ) 1.6 , c ) 1.7 , d ) 1.8 , e ) 1.9

Ex Output:

a