You will be given a definition of a task first, then some input of the task.
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'.

Problem: if the cost price is 80 % of the selling price , then what is the profit percent ? 
Options: a ) 5 % , b ) 11 % , c ) 13 % , d ) 25 % , e ) 19 %
Output:
d