-80.25% is the change from 638 to 126
Calculation steps:
[( 126 - 638 ) ÷ 638] x 100 = -80.25%
Formula
Percentage change = [(126 - 638) / 638] x 100
Subtract the new number by the original number
126 - 638 = -512
-512 ÷ 638 = -0.8025078369905956
-0.8025078369905956 x 100 = -80.25%