-96.7% is the change from 909 to 30
Calculation steps:
[( 30 - 909 ) ÷ 909] x 100 = -96.7%
Formula
Percentage change = [(30 - 909) / 909] x 100
Subtract the new number by the original number
30 - 909 = -879
-879 ÷ 909 = -0.966996699669967
-0.966996699669967 x 100 = -96.7%