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: by selling an article for $ 90 , a person gains $ 15 . what is the gain % ? 
Options: a ) 25 % , b ) 30 % , c ) 50 % , d ) 20 % , e ) 10 %

Output: d


Input: Consider 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

Output: c


Input: Consider Input: Problem: some of the 50 % solution of acid was removed and this was replaced with an equal amount of 14 % solution of acid . as a result , a 23 % solution of acid was obtained . what fraction of the original solution was replaced ? 
Options: a ) 1 / 2 , b ) 1 / 3 , c ) 2 / 3 , d ) 3 / 4 , e ) 4 / 5


Output: d