-55.02% is the change from 638 to 287
Calculation steps:
[( 287 - 638 ) ÷ 638] x 100 = -55.02%
Formula
Percentage change = [(287 - 638) / 638] x 100
Subtract the new number by the original number
287 - 638 = -351
-351 ÷ 638 = -0.5501567398119123
-0.5501567398119123 x 100 = -55.02%