-11.15% is the change from 287 to 255
Calculation steps:
[( 255 - 287 ) ÷ 287] x 100 = -11.15%
Formula
Percentage change = [(255 - 287) / 287] x 100
Subtract the new number by the original number
255 - 287 = -32
-32 ÷ 287 = -0.11149825783972125
-0.11149825783972125 x 100 = -11.15%