4221.05% is the change from 19 to 821
Calculation steps:
[( 821 - 19 ) ÷ 19] x 100 = 4221.05%
Formula
Percentage change = [(821 - 19) / 19] x 100
Subtract the new number by the original number
821 - 19 = 802
802 ÷ 19 = 42.21052631578947
42.21052631578947 x 100 = 4221.05%