889.9% is the change from 99 to 980
Calculation steps:
[( 980 - 99 ) ÷ 99] x 100 = 889.9%
Formula
Percentage change = [(980 - 99) / 99] x 100
Subtract the new number by the original number
980 - 99 = 881
881 ÷ 99 = 8.8989898989899
8.8989898989899 x 100 = 889.9%