-96.35% is the change from 823 to 30
Calculation steps:
[( 30 - 823 ) ÷ 823] x 100 = -96.35%
Formula
Percentage change = [(30 - 823) / 823] x 100
Subtract the new number by the original number
30 - 823 = -793
-793 ÷ 823 = -0.9635479951397327
-0.9635479951397327 x 100 = -96.35%