-55.33% is the change from 638 to 285
Calculation steps:
[( 285 - 638 ) ÷ 638] x 100 = -55.33%
Formula
Percentage change = [(285 - 638) / 638] x 100
Subtract the new number by the original number
285 - 638 = -353
-353 ÷ 638 = -0.5532915360501567
-0.5532915360501567 x 100 = -55.33%