-92.32% is the change from 638 to 49
Calculation steps:
[( 49 - 638 ) ÷ 638] x 100 = -92.32%
Formula
Percentage change = [(49 - 638) / 638] x 100
Subtract the new number by the original number
49 - 638 = -589
-589 ÷ 638 = -0.9231974921630094
-0.9231974921630094 x 100 = -92.32%