35.74% is the change from 638 to 866
Calculation steps:
[( 866 - 638 ) ÷ 638] x 100 = 35.74%
Formula
Percentage change = [(866 - 638) / 638] x 100
Subtract the new number by the original number
866 - 638 = 228
228 ÷ 638 = 0.3573667711598746
0.3573667711598746 x 100 = 35.74%