-96.25% is the change from 800 to 30
Calculation steps:
[( 30 - 800 ) ÷ 800] x 100 = -96.25%
Formula
Percentage change = [(30 - 800) / 800] x 100
Subtract the new number by the original number
30 - 800 = -770
-770 ÷ 800 = -0.9625
-0.9625 x 100 = -96.25%