3093.55% is the change from 31 to 990
Calculation steps:
[( 990 - 31 ) ÷ 31] x 100 = 3093.55%
Formula
Percentage change = [(990 - 31) / 31] x 100
Subtract the new number by the original number
990 - 31 = 959
959 ÷ 31 = 30.93548387096774
30.93548387096774 x 100 = 3093.55%