-79.1% is the change from 780 to 163
Calculation steps:
[( 163 - 780 ) ÷ 780] x 100 = -79.1%
Formula
Percentage change = [(163 - 780) / 780] x 100
Subtract the new number by the original number
163 - 780 = -617
-617 ÷ 780 = -0.791025641025641
-0.791025641025641 x 100 = -79.1%