4200% is the change from 19 to 817
Calculation steps:
[( 817 - 19 ) ÷ 19] x 100 = 4200%
Formula
Percentage change = [(817 - 19) / 19] x 100
Subtract the new number by the original number
817 - 19 = 798
798 ÷ 19 = 42
42 x 100 = 4200%
Example