-82.51% is the change from 509 to 89
Calculation steps:
[( 89 - 509 ) ÷ 509] x 100 = -82.51%
Formula
Percentage change = [(89 - 509) / 509] x 100
Subtract the new number by the original number
89 - 509 = -420
-420 ÷ 509 = -0.825147347740668
-0.825147347740668 x 100 = -82.51%