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 shop owner sells 15 mtr of cloth and gains sp of 10 mtrs . find the gain % ? 
Options: a ) 30 % , b ) 40 % , c ) 50 % , d ) 100 % , e ) 200 %
Output:
e