-87.29% is the change from 779 to 99
Calculation steps:
[( 99 - 779 ) ÷ 779] x 100 = -87.29%
Formula
Percentage change = [(99 - 779) / 779] x 100
Subtract the new number by the original number
99 - 779 = -680
-680 ÷ 779 = -0.8729139922978177
-0.8729139922978177 x 100 = -87.29%