-80.47% is the change from 635 to 124
Calculation steps:
[( 124 - 635 ) ÷ 635] x 100 = -80.47%
Formula
Percentage change = [(124 - 635) / 635] x 100
Subtract the new number by the original number
124 - 635 = -511
-511 ÷ 635 = -0.8047244094488188
-0.8047244094488188 x 100 = -80.47%