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'.

Example Input: Problem: sheela deposits rs . 4500 in bank savings account . if this is 28 % of her monthly income . what is her monthly income in ?
Options: a ) 22000 , b ) 27000 , c ) 16071 , d ) 16789 , e ) none of these
Example Output: c

Example Input: Problem: a store sells chairs and tables . if the price of 2 chairs and 1 table is 60 % of the price of 1 chair and 2 tables , and the price of 1 table and 1 chair is $ 96 , what is the price , in dollars , of 1 table ? ( assume that every chair has the same price and every table has the same price . )
Options: a ) 81 , b ) 84 , c ) 85 , d ) 88 , e ) 90
Example Output: b

Example Input: Problem: an article is sold at a certain price . by selling it at 2 / 3 of that price one loses 10 % . find the gain percent at original price ?
Options: a ) 25 % , b ) 20 % , c ) 35 % , d ) 40 % , e ) 50 %
Example Output:
c