100% is the change from 404 to 808
Calculation steps:
[( 808 - 404 ) ÷ 404] x 100 = 100%
Formula
Percentage change = [(808 - 404) / 404] x 100
Subtract the new number by the original number
808 - 404 = 404
404 ÷ 404 = 1
1 x 100 = 100%
Example