-96.4% is the change from 833 to 30
Calculation steps:
[( 30 - 833 ) ÷ 833] x 100 = -96.4%
Formula
Percentage change = [(30 - 833) / 833] x 100
Subtract the new number by the original number
30 - 833 = -803
-803 ÷ 833 = -0.963985594237695
-0.963985594237695 x 100 = -96.4%