-35.29% is the change from 649 to 420
Calculation steps:
[( 420 - 649 ) ÷ 649] x 100 = -35.29%
Formula
Percentage change = [(420 - 649) / 649] x 100
Subtract the new number by the original number
420 - 649 = -229
-229 ÷ 649 = -0.35285053929121724
-0.35285053929121724 x 100 = -35.29%