3096.77% is the change from 31 to 991
Calculation steps:
[( 991 - 31 ) ÷ 31] x 100 = 3096.77%
Formula
Percentage change = [(991 - 31) / 31] x 100
Subtract the new number by the original number
991 - 31 = 960
960 ÷ 31 = 30.967741935483872
30.967741935483872 x 100 = 3096.77%