29.64% is the change from 668 to 866
Calculation steps:
[( 866 - 668 ) ÷ 668] x 100 = 29.64%
Formula
Percentage change = [(866 - 668) / 668] x 100
Subtract the new number by the original number
866 - 668 = 198
198 ÷ 668 = 0.2964071856287425
0.2964071856287425 x 100 = 29.64%