-82.18% is the change from 505 to 90
Calculation steps:
[( 90 - 505 ) ÷ 505] x 100 = -82.18%
Formula
Percentage change = [(90 - 505) / 505] x 100
Subtract the new number by the original number
90 - 505 = -415
-415 ÷ 505 = -0.8217821782178217
-0.8217821782178217 x 100 = -82.18%