-48.69% is the change from 497 to 255
Calculation steps:
[( 255 - 497 ) ÷ 497] x 100 = -48.69%
Formula
Percentage change = [(255 - 497) / 497] x 100
Subtract the new number by the original number
255 - 497 = -242
-242 ÷ 497 = -0.4869215291750503
-0.4869215291750503 x 100 = -48.69%