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: by selling 20 pencils for a rupee a man loses 20 % . how many for a rupee should he sell in order to gain 20 % ? 
Options: a ) 80 , b ) 60 , c ) 50 , d ) 30 , e ) 10
Output:
d