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: the market value of a certain machine decreased by 10 percent of its purchase price each year . if the machine was purchased in 1982 for its market value of $ 8000 , what was its market value two years later ? 
Options: a ) $ 8,000 , b ) $ 5,600 , c ) $ 3,200 , d ) $ 6,400 , e ) $ 800

Output: d


Input: Consider Input: Problem: 33 1 / 3 % of 360 ? 
Options: a ) 80 , b ) 90 , c ) 110 , d ) 120 , e ) 130

Output: d


Input: Consider Input: Problem: a shopkeeper forced to sell at cost price , uses a 900 grams weight for a kilogram . what is his gain percent ? 
Options: a ) 10 % , b ) 9 % , c ) 11.11 % , d ) 12 % , e ) none of these


Output: c