3.61% is the change from 831 to 861
Calculation steps:
[( 861 - 831 ) ÷ 831] x 100 = 3.61%
Formula
Percentage change = [(861 - 831) / 831] x 100
Subtract the new number by the original number
861 - 831 = 30
30 ÷ 831 = 0.036101083032490974
0.036101083032490974 x 100 = 3.61%