879.8% is the change from 99 to 970
Calculation steps:
[( 970 - 99 ) ÷ 99] x 100 = 879.8%
Formula
Percentage change = [(970 - 99) / 99] x 100
Subtract the new number by the original number
970 - 99 = 871
871 ÷ 99 = 8.797979797979798
8.797979797979798 x 100 = 879.8%