-92.16% is the change from 638 to 50
Calculation steps:
[( 50 - 638 ) ÷ 638] x 100 = -92.16%
Formula
Percentage change = [(50 - 638) / 638] x 100
Subtract the new number by the original number
50 - 638 = -588
-588 ÷ 638 = -0.9216300940438872
-0.9216300940438872 x 100 = -92.16%