129.1% is the change from 378 to 866
Calculation steps:
[( 866 - 378 ) ÷ 378] x 100 = 129.1%
Formula
Percentage change = [(866 - 378) / 378] x 100
Subtract the new number by the original number
866 - 378 = 488
488 ÷ 378 = 1.291005291005291
1.291005291005291 x 100 = 129.1%