686.87% is the change from 99 to 779
Calculation steps:
[( 779 - 99 ) ÷ 99] x 100 = 686.87%
Formula
Percentage change = [(779 - 99) / 99] x 100
Subtract the new number by the original number
779 - 99 = 680
680 ÷ 99 = 6.8686868686868685
6.8686868686868685 x 100 = 686.87%