786.87% is the change from 99 to 878
Calculation steps:
[( 878 - 99 ) ÷ 99] x 100 = 786.87%
Formula
Percentage change = [(878 - 99) / 99] x 100
Subtract the new number by the original number
878 - 99 = 779
779 ÷ 99 = 7.8686868686868685
7.8686868686868685 x 100 = 786.87%