2.41% is the change from 831 to 851
Calculation steps:
[( 851 - 831 ) ÷ 831] x 100 = 2.41%
Formula
Percentage change = [(851 - 831) / 831] x 100
Subtract the new number by the original number
851 - 831 = 20
20 ÷ 831 = 0.024067388688327317
0.024067388688327317 x 100 = 2.41%