-11.72% is the change from 290 to 256
Calculation steps:
[( 256 - 290 ) ÷ 290] x 100 = -11.72%
Formula
Percentage change = [(256 - 290) / 290] x 100
Subtract the new number by the original number
256 - 290 = -34
-34 ÷ 290 = -0.11724137931034483
-0.11724137931034483 x 100 = -11.72%