20100% is the change from 4 to 808
Calculation steps:
[( 808 - 4 ) ÷ 4] x 100 = 20100%
Formula
Percentage change = [(808 - 4) / 4] x 100
Subtract the new number by the original number
808 - 4 = 804
804 ÷ 4 = 201
201 x 100 = 20100%
Example