-98.6% is the change from 285 to 4
Calculation steps:
[( 4 - 285 ) ÷ 285] x 100 = -98.6%
Formula
Percentage change = [(4 - 285) / 285] x 100
Subtract the new number by the original number
4 - 285 = -281
-281 ÷ 285 = -0.9859649122807017
-0.9859649122807017 x 100 = -98.6%