-7.15% is the change from 839 to 779
Calculation steps:
[( 779 - 839 ) ÷ 839] x 100 = -7.15%
Formula
Percentage change = [(779 - 839) / 839] x 100
Subtract the new number by the original number
779 - 839 = -60
-60 ÷ 839 = -0.07151370679380215
-0.07151370679380215 x 100 = -7.15%