1089.29% is the change from 84 to 999
Calculation steps:
[( 999 - 84 ) ÷ 84] x 100 = 1089.29%
Formula
Percentage change = [(999 - 84) / 84] x 100
Subtract the new number by the original number
999 - 84 = 915
915 ÷ 84 = 10.892857142857142
10.892857142857142 x 100 = 1089.29%