-81.24% is the change from 661 to 124
Calculation steps:
[( 124 - 661 ) ÷ 661] x 100 = -81.24%
Formula
Percentage change = [(124 - 661) / 661] x 100
Subtract the new number by the original number
124 - 661 = -537
-537 ÷ 661 = -0.8124054462934948
-0.8124054462934948 x 100 = -81.24%