-47.85% is the change from 489 to 255
Calculation steps:
[( 255 - 489 ) ÷ 489] x 100 = -47.85%
Formula
Percentage change = [(255 - 489) / 489] x 100
Subtract the new number by the original number
255 - 489 = -234
-234 ÷ 489 = -0.4785276073619632
-0.4785276073619632 x 100 = -47.85%