123.2% is the change from 388 to 866
Calculation steps:
[( 866 - 388 ) ÷ 388] x 100 = 123.2%
Formula
Percentage change = [(866 - 388) / 388] x 100
Subtract the new number by the original number
866 - 388 = 478
478 ÷ 388 = 1.231958762886598
1.231958762886598 x 100 = 123.2%