-89.51% is the change from 286 to 30
Calculation steps:
[( 30 - 286 ) ÷ 286] x 100 = -89.51%
Formula
Percentage change = [(30 - 286) / 286] x 100
Subtract the new number by the original number
30 - 286 = -256
-256 ÷ 286 = -0.8951048951048951
-0.8951048951048951 x 100 = -89.51%