Detailed 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'.
Q: Problem: a number increased by 20 % gives 480 . the number is 
Options: a ) 200 , b ) 400 , c ) 300 , d ) 450 , e ) 500
A:
b