10.23% is the change from 391 to 431
Calculation steps:
[( 431 - 391 ) ÷ 391] x 100 = 10.23%
Formula
Percentage change = [(431 - 391) / 391] x 100
Subtract the new number by the original number
431 - 391 = 40
40 ÷ 391 = 0.10230179028132992
0.10230179028132992 x 100 = 10.23%