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'.

Input: Consider Input: Problem: at what rate percent per annum will the simple interest on a sum of money be 1 / 5 of the amount in 10 years ? 
Options: a ) 2 % , b ) 7 % , c ) 9 % , d ) 3 % , e ) 1 %

Output: a


Input: Consider Input: Problem: the population of a town is 10000 . it increases annually at the rate of 27 % p . a . what will be its population after 2 years ? 
Options: a ) 14000 , b ) 14400 , c ) 16129 , d ) 14600 , e ) 14700

Output: c


Input: Consider Input: Problem: a shopkeeper forced to sell at cost price , uses a 950 grams weight for a kilogram . what is his gain percent ? 
Options: a ) 10 % , b ) 9 % , c ) 11.11 % , d ) 5.26 % , e ) none of these


Output: d


