399.39% is the change from 164 to 819
Calculation steps:
[( 819 - 164 ) ÷ 164] x 100 = 399.39%
Formula
Percentage change = [(819 - 164) / 164] x 100
Subtract the new number by the original number
819 - 164 = 655
655 ÷ 164 = 3.9939024390243905
3.9939024390243905 x 100 = 399.39%