-98.85% is the change from 780 to 9
Calculation steps:
[( 9 - 780 ) ÷ 780] x 100 = -98.85%
Formula
Percentage change = [(9 - 780) / 780] x 100
Subtract the new number by the original number
9 - 780 = -771
-771 ÷ 780 = -0.9884615384615385
-0.9884615384615385 x 100 = -98.85%