-47.42% is the change from 485 to 255
Calculation steps:
[( 255 - 485 ) ÷ 485] x 100 = -47.42%
Formula
Percentage change = [(255 - 485) / 485] x 100
Subtract the new number by the original number
255 - 485 = -230
-230 ÷ 485 = -0.4742268041237113
-0.4742268041237113 x 100 = -47.42%