870.71% is the change from 99 to 961
Calculation steps:
[( 961 - 99 ) ÷ 99] x 100 = 870.71%
Formula
Percentage change = [(961 - 99) / 99] x 100
Subtract the new number by the original number
961 - 99 = 862
862 ÷ 99 = 8.707070707070708
8.707070707070708 x 100 = 870.71%