-55.37% is the change from 643 to 287
Calculation steps:
[( 287 - 643 ) ÷ 643] x 100 = -55.37%
Formula
Percentage change = [(287 - 643) / 643] x 100
Subtract the new number by the original number
287 - 643 = -356
-356 ÷ 643 = -0.5536547433903577
-0.5536547433903577 x 100 = -55.37%