-96.47% is the change from 849 to 30
Calculation steps:
[( 30 - 849 ) ÷ 849] x 100 = -96.47%
Formula
Percentage change = [(30 - 849) / 849] x 100
Subtract the new number by the original number
30 - 849 = -819
-819 ÷ 849 = -0.9646643109540636
-0.9646643109540636 x 100 = -96.47%