-87.59% is the change from 999 to 124
Calculation steps:
[( 124 - 999 ) ÷ 999] x 100 = -87.59%
Formula
Percentage change = [(124 - 999) / 999] x 100
Subtract the new number by the original number
124 - 999 = -875
-875 ÷ 999 = -0.8758758758758759
-0.8758758758758759 x 100 = -87.59%