-30.12% is the change from 840 to 587
Calculation steps:
[( 587 - 840 ) ÷ 840] x 100 = -30.12%
Formula
Percentage change = [(587 - 840) / 840] x 100
Subtract the new number by the original number
587 - 840 = -253
-253 ÷ 840 = -0.3011904761904762
-0.3011904761904762 x 100 = -30.12%