-81.71% is the change from 678 to 124
Calculation steps:
[( 124 - 678 ) ÷ 678] x 100 = -81.71%
Formula
Percentage change = [(124 - 678) / 678] x 100
Subtract the new number by the original number
124 - 678 = -554
-554 ÷ 678 = -0.8171091445427728
-0.8171091445427728 x 100 = -81.71%