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: an article is bought for rs . 675 and sold for rs . 800 , find the gain percent ? 
Options: a ) 38 % , b ) 28 % , c ) 18 % , d ) 22 % , e ) 13 %
Output:
c