20125% is the change from 4 to 809
Calculation steps:
[( 809 - 4 ) ÷ 4] x 100 = 20125%
Formula
Percentage change = [(809 - 4) / 4] x 100
Subtract the new number by the original number
809 - 4 = 805
805 ÷ 4 = 201.25
201.25 x 100 = 20125%
Example