123.77% is the change from 387 to 866
Calculation steps:
[( 866 - 387 ) ÷ 387] x 100 = 123.77%
Formula
Percentage change = [(866 - 387) / 387] x 100
Subtract the new number by the original number
866 - 387 = 479
479 ÷ 387 = 1.2377260981912144
1.2377260981912144 x 100 = 123.77%