421.69% is the change from 166 to 866
Calculation steps:
[( 866 - 166 ) ÷ 166] x 100 = 421.69%
Formula
Percentage change = [(866 - 166) / 166] x 100
Subtract the new number by the original number
866 - 166 = 700
700 ÷ 166 = 4.216867469879518
4.216867469879518 x 100 = 421.69%