30.42% is the change from 664 to 866
Calculation steps:
[( 866 - 664 ) ÷ 664] x 100 = 30.42%
Formula
Percentage change = [(866 - 664) / 664] x 100
Subtract the new number by the original number
866 - 664 = 202
202 ÷ 664 = 0.3042168674698795
0.3042168674698795 x 100 = 30.42%