8.29% is the change from 398 to 431
Calculation steps:
[( 431 - 398 ) ÷ 398] x 100 = 8.29%
Formula
Percentage change = [(431 - 398) / 398] x 100
Subtract the new number by the original number
431 - 398 = 33
33 ÷ 398 = 0.0829145728643216
0.0829145728643216 x 100 = 8.29%