1122.22% is the change from 81 to 990
Calculation steps:
[( 990 - 81 ) ÷ 81] x 100 = 1122.22%
Formula
Percentage change = [(990 - 81) / 81] x 100
Subtract the new number by the original number
990 - 81 = 909
909 ÷ 81 = 11.222222222222221
11.222222222222221 x 100 = 1122.22%