-98.72% is the change from 780 to 10
Calculation steps:
[( 10 - 780 ) ÷ 780] x 100 = -98.72%
Formula
Percentage change = [(10 - 780) / 780] x 100
Subtract the new number by the original number
10 - 780 = -770
-770 ÷ 780 = -0.9871794871794872
-0.9871794871794872 x 100 = -98.72%