-10.49% is the change from 286 to 256
Calculation steps:
[( 256 - 286 ) ÷ 286] x 100 = -10.49%
Formula
Percentage change = [(256 - 286) / 286] x 100
Subtract the new number by the original number
256 - 286 = -30
-30 ÷ 286 = -0.1048951048951049
-0.1048951048951049 x 100 = -10.49%