-65.83% is the change from 840 to 287
Calculation steps:
[( 287 - 840 ) ÷ 840] x 100 = -65.83%
Formula
Percentage change = [(287 - 840) / 840] x 100
Subtract the new number by the original number
287 - 840 = -553
-553 ÷ 840 = -0.6583333333333333
-0.6583333333333333 x 100 = -65.83%