-10.8% is the change from 287 to 256
Calculation steps:
[( 256 - 287 ) ÷ 287] x 100 = -10.8%
Formula
Percentage change = [(256 - 287) / 287] x 100
Subtract the new number by the original number
256 - 287 = -31
-31 ÷ 287 = -0.10801393728222997
-0.10801393728222997 x 100 = -10.8%