-48.8% is the change from 498 to 255
Calculation steps:
[( 255 - 498 ) ÷ 498] x 100 = -48.8%
Formula
Percentage change = [(255 - 498) / 498] x 100
Subtract the new number by the original number
255 - 498 = -243
-243 ÷ 498 = -0.4879518072289157
-0.4879518072289157 x 100 = -48.8%