-98.83% is the change from 770 to 9
Calculation steps:
[( 9 - 770 ) ÷ 770] x 100 = -98.83%
Formula
Percentage change = [(9 - 770) / 770] x 100
Subtract the new number by the original number
9 - 770 = -761
-761 ÷ 770 = -0.9883116883116884
-0.9883116883116884 x 100 = -98.83%