-93.99% is the change from 649 to 39
Calculation steps:
[( 39 - 649 ) ÷ 649] x 100 = -93.99%
Formula
Percentage change = [(39 - 649) / 649] x 100
Subtract the new number by the original number
39 - 649 = -610
-610 ÷ 649 = -0.9399075500770416
-0.9399075500770416 x 100 = -93.99%