-10.05% is the change from 866 to 779
Calculation steps:
[( 779 - 866 ) ÷ 866] x 100 = -10.05%
Formula
Percentage change = [(779 - 866) / 866] x 100
Subtract the new number by the original number
779 - 866 = -87
-87 ÷ 866 = -0.10046189376443418
-0.10046189376443418 x 100 = -10.05%