Instructions: 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: Problem: a man buys an article for $ 110 . and sells it for $ 125 . find the gain percent ? 
Options: a ) 10 % , b ) 13.6 % , c ) 25 % , d ) 20 % , e ) 30 %
Output:
b