839.39% is the change from 99 to 930
Calculation steps:
[( 930 - 99 ) ÷ 99] x 100 = 839.39%
Formula
Percentage change = [(930 - 99) / 99] x 100
Subtract the new number by the original number
930 - 99 = 831
831 ÷ 99 = 8.393939393939394
8.393939393939394 x 100 = 839.39%